18-[(2-methylpropan-2-yl)oxy]-18-oxooctadecanoic acid

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

実験手順: Acetonitrile (10 mL) was added to octadecanedioic acid mono-tert-butyl ester (500 mg, 1.3 mmol) and TEA (0.226 mL, 1.6 mmol) was added. Diphenylphosphonic azide (0.37 g, 1.3 mmol) was added in a solution of acetonitrile (1 mL). The mixture was stirred at reflux for 2 h, and at RT for 16 h. The reaction was concentrated under vacuum, and suspended/dissolved in 1:2, AcOEt:heptane (2 mL) and applied to a dry bed of silica (2×4 cm dia). It was eluated with 1:2 AcOEt:heptane (2 mL) and 1:1 AcOEt:heptane (60 mL). The eluate was concentrated to dryness. The residue was partly suspended in THF (2 mL) and 1 N NaOH (2 mL) was added. The turbid solution/suspension was stirred for 1 h at RT. Water (15 mL) was added and this was extracted with AcOEt (2×25 mL), adding some brine to aid separation. The organic phase was washed with sat. NaCl, dried, filtered and conc. to dryness. To the residue was added 20% acetonitrile/water (15 mL), TFA (15-20 ul) and DMSO (1 mL). A filtration of the mixture failed, so the filter and the solution were extracted with DCM (2×60 mL). The organic extracts were concentrated to yield the crude product (0.14 g), was added at reflux for 2 h The reaction was concentrated under vacuum suspended/dissolved in 1:2, AcOEt The eluate was concentrated to dryness 1 N NaOH (2 mL) was added The turbid solution/suspension was stirred for 1 h at RT Water (15 mL) was added this was extracted with AcOEt (2×25 mL) adding some brine separation The organic phase was washed with sat. NaCl dried filtered and conc. to dryness To the residue was added 20% acetonitrile/water (15 mL), TFA (15-20 ul) and DMSO (1 mL) A filtration of the mixture so the filter the solution were extracted with DCM (2×60 mL) The organic extracts were concentrated

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

実験手順: Octadecanedioic acid mono-tert-butyl ester (4.2 g, 0.011 mol) was dissolved in THF (20 mL), TSTU (4 g, 0.013 mol) in acetonitrile (20 mL) was added and pH of the solution was adjusted to 8 with dropwise addition of DIPEA. The mixture was stirred at RT for 4 h, then acidified with HCl (2M) to pH 3 and evaporated in vacuo. The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M). The organic layer was dried (MgSO4), filtered and evaporated to dryness in vacuo. This afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification. LC-MS (electrospray): m/z=468 (M+1) and 412 (M+1-tBu). evaporated in vacuo The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M) The organic layer was dried (MgSO4) filtered evaporated to dryness in vacuo This afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification

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

実験手順: Octadecanedioic acid mono-tert-butyl ester (4.2 g, 0.011 mol) was dissolved in THF (20 mL), TSTU (4 g, 0.013 mol) in acetonitrile (20 mL) was added and pH of the solution was adjusted to 8 with dropwise addition of DIPEA. The mixture was stirred at RT for 4 h, then acidified with HCl (2M) to pH 3 and evaporated in vacuo. The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M). The organic layer was dried (MgSO4), filtered and evaporated to dryness in vacuo. This afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification. LC-MS (electrospray): m/z=468 (M+1) and 412 (M+1-tBu). evaporated in vacuo The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M) The organic layer was dried (MgSO4) filtered evaporated to dryness in vacuo This afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification

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

実験手順: Octadecanedioic acid mono-tert-butyl ester (4.2 g, 0.011 mol) was dissolved in THF (20 mL), TSTU (4 g, 0.013 mol) in acetonitrile (20 mL) was added and pH of the solution was adjusted to 8 with dropwise addition of DIPEA. The mixture was stirred at RT for 4 h, then acidified with HCl (2M) to pH 3 and evaporated in vacuo. The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M). The organic layer was dried (MgSO4), filtered and evaporated to dryness in vacuo. This afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification. LC-MS (electrospray): m/z=468 (M+1) and 412 (M+1-tBu). evaporated in vacuo The residual oil was subsequently partitioned between ethyl acetate and HCl (0.1 M) The organic layer was dried (MgSO4) filtered evaporated to dryness in vacuo This afforded 5.2 g of octadecanedioic acid tert-butyl ester 2,5-dioxopyrrolidin-1-yl ester as an oil, which could be used in the next step without further purification