Synthesis of Novel Enantiopure 4-Hydroxypipecolic Acid Derivatives with a Bicyclic β-Lactam Structure from a Common 3-Azido-4-oxoazetidine-2-carbaldehyde Precursor
作者:Benito Alcaide、Pedro Almendros、Amparo Luna、Teresa Martínez del Campo
DOI:10.1021/jo702405h
日期:2008.2.1
Two different stereocontrolled accesses to new 4-hydroxypipecolic acid analogues with a bicyclic β-lactam structure have been developed by using intramolecular reductive amination or allenic hydroamination reactions in 2-azetidinone-tethered azides. The access to the cyclization precursors was achieved from 3-azido-4-oxoazetidine-2-carbaldehyde via metal-mediated carbonyl−allenylation in aqueous environment
通过使用2-氮杂环丁酮系链的叠氮化物中的分子内还原胺化或烯丙氢化胺化反应,已经开发了两种不同的立体控制途径来获得具有双环β-内酰胺结构的新的4-羟基哌酸类似物。通过在水环境中通过金属介导的羰基-烯丙基化反应或通过有机催化直接的醛醇缩合反应,可以从3-叠氮基-4-氧杂氮杂环丁烷-2-甲醛获得环化前体。氢化锡促进的2-氮杂环丁酮固定的叠氮叠氮烯的环化反应对中心的烯丙基碳具有完全的区域选择性,从而提供了稠合的哌啶。