(2,2-dimethyl-1,3-dioxan-5-yl)methanol

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

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

実験手順: MsCl (4.4 mL, 56 mmol) was added slowly to a solution of Et3N (9.8 mL, 71 mmol) and (2,2-dimethyl-[1,3]dioxan-5-yl)-methanol (6.87 g, 47.0 mmol) in CH2Cl2 (100 mL) at 0° C. (bath temp). The reaction mixture was stirred at rt for 2 h and then quenched with H2O (100 mL). The mixture was extracted with CH2Cl2 and the organic fractions were dried (MgSO4) and concentrated in vacuo to give the title compound as a colorless liquid: yield 10.02 g (95%). quenched with H2O (100 mL) The mixture was extracted with CH2Cl2 the organic fractions were dried (MgSO4) concentrated in vacuo

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

実験手順: A solution of 2,2-dimethoxypropane (5.88 g, 56.5 mmol), 2-methyl-propane-1,3-diol (5.0 g, 47 mmol), and PTSA monohydrate (0.48 g, 2.3 mmol) in THF (100 mL) was stirred O/N at rt. The mixture was concentrated in vacuo to give the title compound as a colorless liquid: yield 6.87 g (99%). The mixture was concentrated in vacuo

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 5-hydroxymethyl-2,2-dimethyl-1,3-dioxane (cf:Bates, H. A.; Farina, J.; Tong, M. J. Org. Chem. 1986, 51, 2637, 3.0 g, 20.5 mmol) in 25 mL of dry DME under argon was added via cannula to a slurry of NaH (0.740 g, 80% dispersion in oil, 24.6 mmol) in 60 mL of dry DME cooled to 0° C. The resulting grey slurry was stirred at room temperature for 0.5 h, then recooled to 0° C., and treated with a solution of benzylbromide (4.56 g, 26.7 mmol) in 20 mL of DME. The reaction mixture was stirred at room temperature (rt) overnight and then quenched with 100 ml of H2O. The aqueous layer was separated and extracted with two portions of ethyl acetate. The combined organic layers were then washed with saturated sodium chloride solution, dried over MgSO4, filtered, and concentrated to provide a yellow oil. Purification by column chromatography on silica gel (ethyl acetate/hexane) afforded 3.51 g (72%) of 5-benzyloxymethyl-2,2-dimethyl-1,3-dioxane as a clear colorless liquid. recooled to 0° C. The reaction mixture was stirred at room temperature (rt) overnight quenched with 100 ml of H2O The aqueous layer was separated extracted with two portions of ethyl acetate The combined organic layers were then washed with saturated sodium chloride solution dried over MgSO4 filtered concentrated to provide a yellow oil Purification by column chromatography on silica gel (ethyl acetate/hexane)

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 5-hydroxymethyl-2,2-dimethyl-1,3-dioxane (cf:Bates, H. A.; Farina, J.; Tong, M. J. Org. Chem. 1986, 51, 2637, 3.0 g, 20.5 mmol) in 25 mL of dry DME under argon was added via cannula to a slurry of NaH (0.740 g, 80% dispersion in oil, 24.6 mmol) in 60 mL of dry DME cooled to 0° C. The resulting grey slurry was stirred at room temperature for 0.5 h, then recooled to 0° C., and treated with a solution of benzylbromide (4.56 g, 26.7 mmol) in 20 mL of DME. The reaction mixture was stirred at room temperature (rt) overnight and then quenched with 100 ml of H2O. The aqueous layer was separated and extracted with two portions of ethyl acetate. The combined organic layers were then washed with saturated sodium chloride solution, dried over MgSO4, filtered, and concentrated to provide a yellow oil. Purification by column chromatography on silica gel (ethyl acetate/hexane) afforded 3.51 g (72%) of 5-benzyloxymethyl-2,2-dimethyl-1,3-dioxane as a clear colorless liquid. recooled to 0° C. The reaction mixture was stirred at room temperature (rt) overnight quenched with 100 ml of H2O The aqueous layer was separated extracted with two portions of ethyl acetate The combined organic layers were then washed with saturated sodium chloride solution dried over MgSO4 filtered concentrated to provide a yellow oil Purification by column chromatography on silica gel (ethyl acetate/hexane)

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

実験手順: Triol 3-1 (1 eq.) was dissolved in DMF at a concentration of approximately 0.5 M and 2,2-dimethoxypropane (1.16 eq.) and p-toluenesulfonic acid monohydrate (0.03 eq.) were added. The solution was stirred for one or more days, and was quenched with TEA (0.5 eq.). As much solvent as possible was removed in vacuo and the remainder was purified by distillation under vacuum. were added As much solvent as possible was removed in vacuo the remainder was purified by distillation under vacuum

反応条件: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A mixture of 2-Hydroxymethyl-1,3-propanediol (9.0 g, 61.6 mmol), 2,2-dimethoxypropane (11.7 ml, 95.2 mmol) 4-toluenesulphonic acid monohydrate (0.49 g, 2.58 mmol) and tetrahydrofuran (450 ml) was stirred at 20° C. for 1 hour. Triethylamine (5 ml) was then added and the solvent removed under reduced pressure. Chromatography on silica gel (eluted with chloroform ethanol, 10.1) afforded the title compound (9.62 g, 78%) as a colourless oil. 1R: υmax (film) 3431, 2993, 2943, 2874, 1482, 1456, 1373 cm-1. 1H NMR: δH [(CD3)2SO] 1.30(6H, s, 2×CH3), 1.69(1H,m,CH), 3.38(2H,dd, J=5.2, 6.6 Hz, CH2OH), 3.61(2H,dd, J=11.8, 7.1 Hz, 2×H(ax)), 3.82 (2H, dd, J=11.8, 4.4 Hz, 2×H(eq)), 4.53(1H, t, J=5.2 Hz, D2O exchangable, OH). Found: C, 56.73; H, 9.80%. C7H14O3.0.01H2O requires: C, 56.80; H, 9.69%. the solvent removed under reduced pressure