Asymmetric synthesis of a tricyclic core structure of the securinega alkaloids virosecurinine and allosecurinine
作者:Rainer Kammler、Kurt Polborn、Klaus Th Wanner
DOI:10.1016/s0040-4020(03)00406-x
日期:2003.4
asymmetric synthesis of tricyclic core structures of virosecurinine [(+)-1] and allosecurinine [(−)-2] is presented. An asymmetric electrophilic α-amidoalkylation reaction employing a chiral enamide gave access to enantiopure (S)-2-anisylpiperidine with the diastereoselectivity (d.s.) of 93/7. The latter was transformed into the target compounds, with the main steps involving a Birch-reduction followed
提出了一个简单的不对称合成三环核心结构的维罗斯可瑞宁[(+)- 1 ]和阿洛斯可宁[[-]- 2 ]。使用手性烯酰胺的不对称亲电α-酰胺基烷基化反应可得到对映纯(S)-2-茴香基哌啶,非对映选择性(ds)为93/7。后者被转化为目标化合物,主要步骤包括还原桦木,然后将所得的1,4-环己二烯进行臭氧分解,最后进行螺环化反应。