作者:Martin E. Maier、Tzvetelina Lapeva
DOI:10.1055/s-1998-1789
日期:1998.8
Starting from 5-pentenaldehyde 1, the 1-allyl-4-pentenylamines 2a-d were prepared. The ring closing metathesis reaction of these dienes using the Grubbs catalyst 3 gave the corresponding cyclohexenylamines 4a, b and 4d in high yield. The secondary amine 2c was recovered unchanged. This route to compound 4d represents a formal total synthesis of the alkaloid epibatidine. In additon, 4b was transformed by electrophilic transannular cyclization to the bicyclic urethanes 5a and 5b.
从 5-戊烯醛 1 开始,制备出 1-烯丙基-4-戊烯胺 2a-d。使用 Grubbs 催化剂 3 对这些二烯进行闭环偏析反应,可以高产率地得到相应的环己烯胺 4a、b 和 4d。回收的仲胺 2c 并无变化。化合物 4d 的这一合成路线代表了生物碱表巴丁的正式全合成。此外,4b 通过亲电跨annular 环化反应转化为双环氨基甲酸酯 5a 和 5b。