An Unusual Ruthenium-Catalyzed Cycloisomerization of Alkynes and Propargyl Alcohols
作者:Barry M. Trost、Michael T. Rudd
DOI:10.1021/ja012672a
日期:2002.4.1
CpRu(NCCH3)3+PF6- catalyzes the cycloisomerization of diyne-ols to alpha,beta,gamma,delta-unsaturated aldehydes and ketones in good-to-excellent yields. 1-Hydroxy-2,7-diynes and 1-hydroxy-2,8-diynes can be utilized to form highly functionalized five- and six-membered rings, respectively. Tertiary as well as secondary propargyl alcohols are cycloisomerized to a single isomeric product. A wide variety
CpRu(NCCH3)3+PF6- 催化二炔醇环异构化为 α、β、γ、δ 不饱和醛和酮,产率从好到极好。1-羟基-2,7-二炔和1-羟基-2,8-二炔可分别用于形成高度官能化的五元环和六元环。叔炔醇和仲炔丙醇被环异构化成单一的异构产物。可以容忍多种系绳替代。甚至可以使用完全未取代的系链,因为环化不需要成对二取代基。在反应过程中消除了替代“内部”炔丙基位置上的额外羟基取代基——这一特征导致了方便的环戊二烯合成。此外,3-羟基-1,6-二炔也可以环化形成交叉共轭醛。