terminal position leading again to five-membered cyclic products in fair to very good yields. Cycloisomerization products were subjected to sequential hydroboration as well as hydrogenation of the exo-methylene functional group. Promising diastereoselectivities were achieved and these reaction sequences could be efficiently performed in a one-pot procedure.
描述了基于[Ni(烯丙基)(cod)] [BARF]和Wilke的氮杂膦烯基全部-(R)-1的催化剂体系对1,6-二烯的高度立体选择性环异构化。从对称取代的1,6-二烯形成五元环状产物获得了前所未有的高对映体过量,最高可达91%。对于在末端位置取代的不对称1,6-二烯,也实现了较高的
化学和区域选择性,从而再次以合理的非常高的收率获得了五元环状产物。环化异构化产物先后进行
硼氢化和exo加氢-亚甲基官能团。实现了有希望的非对映选择性,并且这些反应序列可以一锅法高效进行。