Asymmetric electrophilic methoxyselenenylations and cyclizations with 3-camphorseleno derivatives
作者:Thomas G. Back、Brian P. Dyck、Siqiao Nan
DOI:10.1016/s0040-4020(98)01133-8
日期:1999.3
A series of novel 3-camphor-based diselenides, differing in substitution at C-2, was prepared. The corresponding allyl selenides were used as protecting groups for the diselenide moieties in several subsequent transformations. The diastereoselective methoxyselenenylation of alkenes was achieved with methanolic selenenyl triflates derived from the camphor diselenides, of which the 2-keto analogue proved
制备了一系列新颖的基于3-樟脑的二硒烯,其在C-2处的取代不同。相应的烯丙基硒化物在几个随后的转化中用作二硒化物部分的保护基。用衍生自樟脑二硒化物的甲醇亚硒基三氟甲磺酸酯可实现烯烃的非对映选择性甲氧基硒烯化,其中2-酮类似物被证明是最有效的。用相应的硒烯基氯化物最有效地进行不饱和醇,羧酸或酰胺的非对映选择性亲电环化反应,该化合物在樟脑残基的C-2处含有一个螺-恶唑烷酮部分。几种产品的绝对构型由还原脱硒法确定。