Ni-promoted Cyclopentenone Formation by Intramolecular Cyclocarbonylation of 1-Bromo-1,4-dienes
作者:Amadeu Llebaria、Francisco Camps、Josep Ma Moretó
DOI:10.1016/s0040-4020(01)85818-x
日期:1993.2
the formation of 1-bromo-1,4-dienes which were further converted to cyclopentenones through a Ni(CO)4 promoted carbonylation-cyclization process. Four CC bonds are formed by this two step sequence, leading to 2,3-substituted 5-methoxycarbonylmethylcyclopentenones 1. Application of this procedure to 2-butyne affords cyclopentenone 1c, an immediate precursor of the antibiotic methylenomicyn B.
立体选择性合成除了烯丙基溴通过在1-溴-1,4-二烯,其进一步通过的Ni(CO)转化为环戊烯酮的形成钯(II),溴化结果催化乙炔4促进的羰基化的环化过程。通过这两个步骤序列形成四个CC键,从而生成2,3-取代的5-甲氧羰基甲基环戊烯酮1。将该方法应用于2-丁炔,可得到环戊烯酮1c,即抗生素甲基enomicyn B的直接前体。