Rhodium- and palladium-catalysed formation of conjugated mono- and bis-exocyclic dienes. 5-Exo-trig versus 6-endo-trig cyclisations
作者:Ronald Grigg、Paul Stevenson、Tanachat Worakun
DOI:10.1039/c39840001073
日期:——
2-Bromo-1,6-dienes are catalytically cylised to give conjugated 5-membered bis-exocylic dines and 6-membered mono-exocyclic dienes by rhodium and palladium catalysts, the specificity for a 5- or 6-membered ring being a function of substrate, catalyst, and added base; 2-bromo-1,7-dienes cyclise regiospecifically to give 6-membered rings.
通过铑和钯催化剂将2-溴-1,6-二烯催化化,得到共轭的5元双-外环二烯和6元的单-外环二烯,对5-或6-元环的特异性是一个函数底物,催化剂和添加的碱;2-bromo-1,7-二烯环特异性地环化得到6元环。