反应详情

To a stirred solution of 5.77 ml (66.78 mmol) of chlorosulfonyl isocyanate in methylene chloride was added, under nitrogen, benzyl alcohol (6.89 ml, 66.57 mmol) at 0°-5° C. After stirring the above solution for 1 hour, a solution of 13.166 g (62.78 mmol) of 2-(3-methylbutyl)-sarcosine methyl ester hydrochloride in methylene chloride containing triethylamine (27.33 ml, 194.62 mmol) was added at 0°-5° C. and the resulting mixture was stirred overnight allowing the mixture to warm to room temperature. The reaction mixture was poured into 600 ml of a 10% aq. HCl solution, saturated with sodium chloride, and the organic layer was separated. The aqueous layer was extracted with methylene chloride and the combined organic layer was washed with brine, dried over magnesium sulfate and concentrated in vacuo to yield 21.22 g (87.2%) of N-(carbobenzyloxyaminosulfonyl)-2-(3-methylbutyl)-sarcosine methyl ester (Formula XI: R=CH3 ; R1 =H; R2 =(CH2)2CH(CH3)2 ; R3 =CH3) which was purified by silica column chromatography (20% ethyl acetate in hexane) to afford an oil.

1. customat 0°-5° C
2. additionwas added at 0°-5° C.
3. stirringthe resulting mixture was stirred overnight
4. customthe organic layer was separated
5. extractionThe aqueous layer was extracted with methylene chloride
6. washthe combined organic layer was washed with brine
7. dry with materialdried over magnesium sulfate
8. concentrationconcentrated in vacuo