Reductive Cyclization of Bromoenynamides with Alcohols as Hydride Source: Synthesis and Reactions of 2-Amidodienes
作者:Rebecca L. Greenaway、Craig D. Campbell、Helen A. Chapman、Edward A. Anderson
DOI:10.1002/adsc.201200703
日期:2012.11.26
Under basic conditions in alcoholic solvents, bromoenynamides undergo palladium-catalyzed cyclization to cyclic 2-amidodienes in good to excellent yields. This process represents the first use of an alcohol as a hydride source in an alkyne carbopalladation/termination sequence, with the site selectivity of the reduction showing a strong dependence on the tethering ring size (5–8), and the nature of
在碱性条件下,在醇溶剂中,溴乙酰胺经过钯催化的环化反应,生成高产率的环2-酰胺基二烯。该过程代表了在炔烃碳氢键/终止序列中首次将醇用作氢化物来源,还原的位点选择性强烈依赖于束缚环的大小(5-8),以及醇和根据。二烯与各种亲二烯体(包括烯烃,炔烃和芳烃)在各种条件下的反应产生了双环和三环的氮杂环,它们可以进一步被氧化成芳族的氮杂环。