作者:Frode Rise、Kjell Undheim
DOI:10.1016/0022-328x(85)80160-1
日期:1985.8
Regioselectivity is observed in 11-adduct formation between phenylethynyltriisopropoxytitanium and 2(1/H)-pyrimidinones; the new carbon-carbon bond is formed at C(4). In contrast the 3,4- and 3,6-dihydro products are formed together from the corresponding magnesium and lithium reagents, but from the magnesium compound the major product is the 3,6-dihydro isomer. Ethynylmagnesium bromide gives equimolar
在苯基乙炔基三异丙氧基钛与2(1 / H)-嘧啶酮之间的11加合物形成中观察到区域选择性。新的碳-碳键在C(4)处形成。相反,由相应的镁和锂试剂一起形成3,4-和3,6-二氢产物,但是由镁化合物形成的主要产物是3,6-二氢异构体。乙炔基溴化镁产生等摩尔量的3,4-和3,6-二氢异构体。产物的脱氢得到炔基化的芳族杂环。