Synthesis and some transformations of 1-azido-glycopyranosyl cyanides-precursors of anomeric α-amino acids
作者:László Somsák、Erzsébet Sós、Zoltán Györgydeák、Jean-Pierre Praly、Gérard Descotes
DOI:10.1016/0040-4020(96)00440-1
日期:1996.7
Acetylated 1-azido-glycopyranosyl cyanides (of the (1R)- 2, and 16, 5, 7, (1R)- 11, and 12 configurations) and 19 were prepared from acetylated 1-halogeno-d-glycopyranosyl cyanides and formamide, resp., by sodium azide in dimethyl sulfoxide. Acetylated (1S)- 14 and (1R)- 15 1-chloro-d-galactopyranosyl cyanides were obtained from cyanide by lithium chloride in dimethyl sulfoxide. 1,3-Dipolar cycloaddition
乙酰化的1-叠氮基吡喃葡萄糖基氰化物(在(1 - [R )- 2,和16,5,7,(1 - [R )- 11和12的配置)和19是从乙酰化制备1 β-卤代-d吡喃葡萄糖氰化物和甲酰胺,分别是叠氮化钠在二甲基亚砜中。通过二甲基亚砜中的氯化锂从氰化物获得乙酰化的(1 S)-14和(1 R)-15 1-氯-d-吡喃半乳糖基氰化物。叠氮化物离子与2的氰基的1,3-偶极环加成和16得到乙酰化的5-(1-叠氮基-1-脱氧-α-和-β-d-吡喃半乳糖基)四唑3和17,而乙炔基二羧酸二甲酯到2的叠氮基部分得到乙酰化的1-甲基二甲基。 (1-叠氮基-1-脱氧-β-d-吡喃半乳糖基)-1,2,3-三唑-4,5-二羧酸20。由乙氧基氯转化3,得到乙酰化的2-(1-叠氮基-1-脱氧-α-d-吡喃半乳糖基)-1,3,4-乙二唑-5-羧酸乙酯21。