Palladium-catalyzed olefin migration and 7- endo - trig cyclization of dehydroalanines
作者:Ma. Carmen García-González、Eduardo Hernández-Vázquez、Fabio A. Vengochea-Gómez、Luis D. Miranda
DOI:10.1016/j.tetlet.2018.01.058
日期:2018.2
1,4- or 1,5-migration of a double bond of dehydroalanines under palladium catalysis is reported. The process occurred with several highly-substituted dehydroalanines under mild typical Heck reaction conditions. Although this was one of the first reports of a palladium-catalyzed 1,5-olefin migration, the outcome of the reaction was susceptible to the starting material. Mechanistically, the process involved
报道了在钯催化下脱氢丙氨酸双键的1,4-或1,5-迁移。该过程是在温和的典型Heck反应条件下用几种高度取代的脱氢丙氨酸发生的。尽管这是钯催化1,5-烯烃迁移的最早报道之一,但反应的结果易受起始原料的影响。从机理上讲,该过程涉及五(1,4-迁移)或六元环(1,5-迁移)有机钯中间体,该中间体在β-氨基消除过程中裂解了C–N键。