14-ethoxy-2,2,13,13-tetramethyl-8,14-dioxotetradecanoic acid

反応条件: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Under Ar atmosphere, to a stirred suspension of lithium borohydride (0.30 g, 95%, 13 mmol) in dichloromethane (80 mL) was added dropwise methanol (0.42 g, 13 mmol), keeping a gentle reflux while hydrogen gas was formed. The mixture was stirred for 10 min at 45° C. and a solution of 2,2,13,13-tetramethyl-7-oxo-tetradecanedioic acid 1-ethyl ester (1.57 g, 4.36 mol) in dichloromethane (10 mL) was added dropwise at such a rate as to maintain a gentle reflux. The reaction mixture was heated at reflux for 24 h, then cooled to room temperature and carefully hydrolyzed with 2 N hydrochloric acid (50 mL) and saturated ammonium chloride solution (120 mL). The aqueous layer was extracted with dichloromethane (4×50 mL). The combined organic layers were washed with water (100 mL) and dried over anhydrous magnesium sulfate. The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g). Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1, then 3:1) followed by recrystallization from dichloromethane gave pure 2,2,13,13-tetramethyltetradecane-1,7,14-triol (0.86 g, 65%) as white needles. M.p.: 79 80° C. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.57 (br. s, 1H), 3.29 (s, 4H), 2.17 (br. s, 3H), 1.46-1.40 (m, 4H), 1.33-1.24 (m, 12H), 0.85 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 71.8, 71.7, 71.5, 38.7, 37.5, 37.3, 35.1, 30.7, 26.6, 25.7, 24.2, 24.0, 23.9, 23.8. HRMS (LSIMS, gly): Calcd. for C18H39O3 (MH+): 303.2899. found: 303.2897. HPLC: 97% purity. was formed to maintain a gentle reflux The reaction mixture was heated at reflux for 24 h cooled to room temperature The aqueous layer was extracted with dichloromethane (4×50 mL) The combined organic layers were washed with water (100 mL) dried over anhydrous magnesium sulfate The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g) Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1 3:1) followed by recrystallization from dichloromethane

反応条件: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Under Ar atmosphere, to a stirred suspension of lithium borohydride (0.30 g, 95%, 13 mmol) in dichloromethane (80 mL) was added dropwise methanol (0.42 g, 13 mmol), keeping a gentle reflux while hydrogen gas was formed. The mixture was stirred for 10 min at 45° C. and a solution of 2,2,13,13-tetramethyl-7-oxo-tetradecanedioic acid 1-ethyl ester (1.57 g, 4.36 mol) in dichloromethane (10 mL) was added dropwise at such a rate as to maintain a gentle reflux. The reaction mixture was heated at reflux for 24 h, then cooled to room temperature and carefully hydrolyzed with 2 N hydrochloric acid (50 mL) and saturated ammonium chloride solution (120 mL). The aqueous layer was extracted with dichloromethane (4×50 mL). The combined organic layers were washed with water (100 mL) and dried over anhydrous magnesium sulfate. The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g). Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1, then 3:1) followed by recrystallization from dichloromethane gave pure 2,2,13,13-tetramethyltetradecane-1,7,14-triol (0.86 g, 65%) as white needles. M.p.: 79 80° C. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.57 (br. s, 1H), 3.29 (s, 4H), 2.17 (br. s, 3H), 1.46-1.40 (m, 4H), 1.33-1.24 (m, 12H), 0.85 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 71.8, 71.7, 71.5, 38.7, 37.5, 37.3, 35.1, 30.7, 26.6, 25.7, 24.2, 24.0, 23.9, 23.8. HRMS (LSIMS, gly): Calcd. for C18H39O3 (MH+): 303.2899. found: 303.2897. HPLC: 97% purity. was formed to maintain a gentle reflux The reaction mixture was heated at reflux for 24 h cooled to room temperature The aqueous layer was extracted with dichloromethane (4×50 mL) The combined organic layers were washed with water (100 mL) dried over anhydrous magnesium sulfate The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g) Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1 3:1) followed by recrystallization from dichloromethane

反応条件: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Under Ar atmosphere, to a stirred suspension of lithium borohydride (0.30 g, 95%, 13 mmol) in dichloromethane (80 mL) was added dropwise methanol (0.42 g, 13 mmol), keeping a gentle reflux while hydrogen gas was formed. The mixture was stirred for 10 min at 45° C. and a solution of 2,2,13,13-tetramethyl-7-oxo-tetradecanedioic acid 1-ethyl ester (1.57 g, 4.36 mol) in dichloromethane (10 mL) was added dropwise at such a rate as to maintain a gentle reflux. The reaction mixture was heated at reflux for 24 h, then cooled to room temperature and carefully hydrolyzed with 2 N hydrochloric acid (50 mL) and saturated ammonium chloride solution (120 mL). The aqueous layer was extracted with dichloromethane (4×50 mL). The combined organic layers were washed with water (100 mL) and dried over anhydrous magnesium sulfate. The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g). Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1, then 3:1) followed by recrystallization from dichloromethane gave pure 2,2,13,13-tetramethyltetradecane-1,7,14-triol (0.86 g, 65%) as white needles. M.p.: 79-80° C. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.57 (br. s, 1H), 3.29 (s, 4H), 2.17 (br. s, 3H), 1.46-1.40 (m, 4H), 1.33-1.24 (m, 12H), 0.85 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 71.8, 71.7, 71.5, 38.7, 37.5, 37.3, 35.1, 30.7, 26.6, 25.7, 24.2, 24.0, 23.9, 23.8. HRMS (LSIMS, gly): Calcd. for C18H39O3 (MH+): 303.2899, found: 303.2897. HPLC: 97% purity. was formed to maintain a gentle reflux The reaction mixture was heated at reflux for 24 h cooled to room temperature The aqueous layer was extracted with dichloromethane (4×50 mL) The combined organic layers were washed with water (100 mL) dried over anhydrous magnesium sulfate The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g) Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1 3:1) followed by recrystallization from dichloromethane

反応条件: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Under Ar atmosphere, to a stirred suspension of lithium borohydride (0.30 g, 95%, 13 mmol) in dichloromethane (80 mL) was added dropwise methanol (0.42 g, 13 mmol), keeping a gentle reflux while hydrogen gas was formed. The mixture was stirred for 10 min at 45° C. and a solution of 2,2,13,13-tetramethyl-7-oxo-tetradecanedioic acid 1-ethyl ester (1.57 g, 4.36 mol) in dichloromethane (10 mL) was added dropwise at such a rate as to maintain a gentle reflux. The reaction mixture was heated at reflux for 24 h, then cooled to room temperature and carefully hydrolyzed with 2 N hydrochloric acid (50 mL) and saturated ammonium chloride solution (120 mL). The aqueous layer was extracted with dichloromethane (4×50 mL). The combined organic layers were washed with water (100 mL) and dried over anhydrous magnesium sulfate. The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g). Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1, then 3:1) followed by recrystallization from dichloromethane gave pure 2,2,13,13-tetramethyltetradecane-1,7,14-triol (0.86 g, 65%) as white needles. M.p.: 79 80° C. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.57 (br. s, 1H), 3.29 (s, 4H), 2.17 (br. s, 3H), 1.46-1.40 (m, 4H), 1.33-1.24 (m, 12H), 0.85 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 71.8, 71.7, 71.5, 38.7, 37.5, 37.3, 35.1, 30.7, 26.6, 25.7, 24.2, 24.0, 23.9, 23.8. HRMS (LSIMS, gly): Calcd. for C18H39O3 (MH+): 303.2899. found: 303.2897. HPLC: 97% purity. was formed to maintain a gentle reflux The reaction mixture was heated at reflux for 24 h cooled to room temperature The aqueous layer was extracted with dichloromethane (4×50 mL) The combined organic layers were washed with water (100 mL) dried over anhydrous magnesium sulfate The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g) Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1 3:1) followed by recrystallization from dichloromethane

反応条件: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Under Ar atmosphere, to a stirred suspension of lithium borohydride (0.30 g, 95%, 13 mmol) in dichloromethane (80 mL) was added dropwise methanol (0.42 g, 13 mmol), keeping a gentle reflux while hydrogen gas was formed. The mixture was stirred for 10 min at 45° C. and a solution of 2,2,13,13-tetramethyl-7-oxo-tetradecanedioic acid 1-ethyl ester (1.57 g, 4.36 mol) in dichloromethane (10 mL) was added dropwise at such a rate as to maintain a gentle reflux. The reaction mixture was heated at reflux for 24 h, then cooled to room temperature and carefully hydrolyzed with 2 N hydrochloric acid (50 mL) and saturated ammonium chloride solution (120 mL). The aqueous layer was extracted with dichloromethane (4×50 mL). The combined organic layers were washed with water (100 mL) and dried over anhydrous magnesium sulfate. The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g). Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1, then 3:1) followed by recrystallization from dichloromethane gave pure 2,2,13,13-tetramethyltetradecane-1,7,14-triol (0.86 g, 65%) as white needles. M.p.: 79-80° C. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.57 (br. s, 1 H), 3.29 (s, 4 H), 2.17 (br. s, 3 H), 1.46-1.40 (m, 4 H), 1.33-1.24 (m, 12 H), 0.85 (s, 12 H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 71.8, 71.7, 71.5, 38.7, 37.5, 37.3, 35.1, 30.7, 26.6, 25.7, 24.2, 24.0, 23.9, 23.8. HRMS (LSIMS, gly): Calcd. for C18H39O3 (MH+): 303.2899, found: 303.2897. HPLC: 97% purity. was formed to maintain a gentle reflux The reaction mixture was heated at reflux for 24 h cooled to room temperature The aqueous layer was extracted with dichloromethane (4×50 mL) The combined organic layers were washed with water (100 mL) dried over anhydrous magnesium sulfate The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g) Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1 3:1) followed by recrystallization from dichloromethane

反応条件: temp:45.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: Under Ar atmosphere, to a stirred suspension of lithium borohydride (0.30 g, 95%, 13 mmol) in dichloromethane (80 mL) was added dropwise methanol (0.42 g, 13 mmol), keeping a gentle reflux while hydrogen gas was formed. The mixture was stirred for 10 min at 45° C. and a solution of 2,2,13,13-tetramethyl-7-oxo-tetradecanedioic acid 1-ethyl ester (1.57 g, 4.36 mol) in dichloromethane (10 mL) was added dropwise at such a rate as to maintain a gentle reflux. The reaction mixture was heated at reflux for 24 h, then cooled to room temperature and carefully hydrolyzed with 2 N hydrochloric acid (50 mL) and saturated ammonium chloride solution (120 mL). The aqueous layer was extracted with dichloromethane (4×50 mL). The combined organic layers were washed with water (100 mL) and dried over anhydrous magnesium sulfate. The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g). Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1, then 3:1) followed by recrystallization from dichloromethane gave pure 2,2,13,13-tetramethyltetradecane-1,7,14-triol (0.86 g, 65%) as white needles. M.p.: 79 80° C. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.57 (br. s, 1H), 3.29 (s, 4H), 2.17 (br. s, 3H), 1.46-1.40 (m, 4H), 1.33-1.24 (m, 12H), 0.85 (s, 12H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 71.8, 71.7, 71.5, 38.7, 37.5, 37.3, 35.1, 30.7, 26.6, 25.7, 24.2, 24.0, 23.9, 23.8. HRMS (LSIMS, gly): Calcd. for C18H39O3 (MH+): 303.2899. found: 303.2897. HPLC: 97% purity. was formed to maintain a gentle reflux The reaction mixture was heated at reflux for 24 h cooled to room temperature The aqueous layer was extracted with dichloromethane (4×50 mL) The combined organic layers were washed with water (100 mL) dried over anhydrous magnesium sulfate The reaction mixture was concentrated to yield the crude product as a yellow oil (1.28 g) Purification by column chromatography on silica gel eluting with hexanes/ethyl acetate (4:1 3:1) followed by recrystallization from dichloromethane