Methyl 2,6-N,N-diacetyl-D-purpurosaminide 4 (methyl 2,6-diacetamido-2,3,4,6-tetradeoxy-alpha-D-erythrohexopyranoside) was synthesized from N-glyoxyloyl-(2R)-bornane-10,2-sultam 2 and 1-methoxybuta-1,3-diene 3 in an 11-step reaction sequence with 6.5% of the overall yield. Copyright (C) 1996 Elsevier Science Ltd
Methyl 2,6-N,N-diacetyl-D-purpurosaminide 4 (methyl 2,6-diacetamido-2,3,4,6-tetradeoxy-alpha-D-erythrohexopyranoside) was synthesized from N-glyoxyloyl-(2R)-bornane-10,2-sultam 2 and 1-methoxybuta-1,3-diene 3 in an 11-step reaction sequence with 6.5% of the overall yield. Copyright (C) 1996 Elsevier Science Ltd
The acid-catalysed reaction of thiols with alkyl 2,3-dideoxy-glyc-2-enopyranosides or glycals
作者:Waldemar Priebe、Aleksander Zamojski
DOI:10.1016/0040-4020(80)80017-2
日期:1980.1
The acid-catalysed (HCl or SnCl4) reaction of alkyl 2,3 dideoxy-glyc-2-enopyranosides or 3,4,6-tri-O-acetyl-D-glycals with thiols leads to mixtures of alkyl 2,3-dideoxy-1-thio-glyc-2-enopyranosides and 3-S-alkyl-3-thioglycals. Under equilibrium conditions the latter are the preponderant products of the reaction. Cross experiments have confirmed the intermediacy of the allylic carbocation in the reaction