反応 #76019

反応方程式

benzyl (5S)-5-amino-6-hydroxyhexylcarbamate

tert-butyl isothiocyanate

ethanol

isothiocyanate

→

ethyl (2S)-6-{[(benzyloxy)carbonyl]amino}-2-{[(tert-butylamino)-carbothioyl]amino}hexanoate

反応条件

実験手順

The process is performed as in Example 9, starting with 0.42 g of benzyl (5S)-5-amino-6-hydroxyhexylcarbamate and 0.24 cm3 of tert-butyl isothiocyanate in 30 cm3 of ethanol at a temperature in the region of 20° C. for 3 days. The reaction is completed by addition of a further 0.48 cm3 of isothiocyanate followed by heating for 1 hour at a temperature in the region of 80° C. After an identical work-up, 0.6 g of ethyl (2S)-6-{[(benzyloxy)carbonyl]amino}-2-{[(tert-butylamino)-carbothioyl]amino}hexanoate is obtained in the form of a beige-colored oil with a tendency to crystallize. (Rf=0.62 in a 90/10 by volume mixture of dichloromethane/methanol, on a Merck 60F254R silica plate).

出典