Synthesis of cis-2-alkoxycyclopropylamines via intramolecular cyclization of 2-azaallylic anions derived from alkoxybrominated N-(arylidene)-2-methyl-2-propenylamines
作者:Sven Mangelinckx、Santosh T. Kadam、Elena Semina、Gert Callebaut、Filip Colpaert、Dirk De Smaele、Norbert De Kimpe
DOI:10.1016/j.tet.2013.02.094
日期:2013.5
N-(Arylidene)-2-alkoxy-3-bromo-2-methylpropylamines, obtained in a straightforward way via regiospecific alkoxybromination of the corresponding N-(2-methyl-2-propenyl)imines, represent promising densely functionalized synthetic building blocks. The substituted N-(3-bromopropyl)imines were deprotonated to the corresponding 2-azaallylic anions, which underwent a highly diastereoselective intramolecular
通过相应N-(2-甲基-2-丙烯基)亚胺的区域特异性烷氧基溴化以直接方式获得的N-(亚芳基)-2-烷氧基-3-溴-2-甲基丙胺代表了有希望的密集官能化的合成结构单元。取代ñ - (3-溴丙基)亚胺进行去质子化以相应的2- azaallylic阴离子,它经历了一个高度非对映分子内闭环,以新的顺式- ñ - (亚芳基)-2-烷氧基-2- methylcyclopropylamines(顺式:反式向上至99:1)的良率至优良率(62–95%)。这些顺式-环丙胺被证明是新的构象受限的β-氨基醚的优良前体。