A Novel Acetonylation of Carbonucleophiles via Palladium-Catalyzed Allylation with Isopropyl 2-Methylene-3,5-dioxahexyl Carbonate
作者:Isao Ikeda、Xue-Ping Gu、Toshio Okuhara、Mitsuo Okahara
DOI:10.1055/s-1990-26778
日期:——
Carbonucleophiles such as malonate esters, ß-keto esters, phenylacetate ester, and phenylacetonitrile were acetonylated in high yields by allylation with isopropyl (or methyl) 2-methylene-3,5-dioxahexyl carbonate (4b or 4a) in the presence of palladium-phosphine catalyst under neutral conditions, followed by acidic hydrolysis. Adopting this procedure dihydrojasmone (7) was prepared from ethyl 3-oxononanoate (6) in an overall yield of 72%.
丙二酸酯、ß-酮酯、苯乙酸酯和苯乙腈等亲碳核物在中性条件下,在钯-膦催化剂存在下,通过与 2-亚甲基-3,5-二氧己基碳酸异丙酯(或甲基)(4b 或 4a)发生烯丙基化反应,然后进行酸性水解,可获得高产率的乙酰化反应。采用这种方法,从 3-氧代壬酸乙酯 (6) 中制备出了二氢茉莉酮 (7),总收率为 72%。