1,4-Pentenyne as a Five-Carbon Synthon for Efficient and Selective Syntheses of Natural Products Containing 2,4-Dimethyl-1-penten-1,5-ylidene and Related Moieties by Means of Zr-Catalyzed Carboalumination of Alkynes and Alkenes
作者:Gangguo Zhu、Ei-ichi Negishi
DOI:10.1002/chem.200701512
日期:2008.1
Two highly efficient protocols for enantioselective synthesis of 2,4-dimethyl-1-penten-1,5-ylidene derivatives involve the combined use of the Zr-catalyzed methylalumination of alkynes (ZMA) and the Zr-catalyzed asymmetric carboalumination of alkenes (ZACA). The ZMA/ZACA protocol has been applied to the synthesis of a nafuredin intermediate 14 and a potential intermediate 18 for milbemycin beta 3,
对映选择性合成2,4-二甲基-1-戊烯-1,5-亚烷基衍生物的两个高效方案涉及Zr催化的炔烃甲基铝化(ZMA)和Zr催化的烯烃不对称碳铝化(ZACA)的组合使用)。ZMA / ZACA协议已被用于合成那富瑞丁中间体14和米尔贝霉素beta 3的潜在中间体18,而ZACA / ZMA协议已被应用于合成(-)-bafilomycin A(1)中间体25岁