作者:Andres Veit、Roman Lenz、Martin E. Seiler、Markus Neuburger、Margareta Zehnder、Bernd Giese
DOI:10.1002/hlca.19930760128
日期:1993.2.10
5-dideoxy-2,5-imino-L-idit (2c), respectively, as a chiral auxiliary lead to high diastereoselectivities in radical reactions (‘tin method’;Scheme 1). Removal of the chiral auxiliaries affords the corresponding alkylated fumaric acids Scheme 2. Single-crystal X-ray structures of 3b and 3c support arguments that lead to the model of 1,4-stereoinduction.
Fumaramides图3b和3c中轴承Ç 2 -symmetrical吡咯烷部分(2 - [R,5 - [R)-2,5-双(甲氧基甲基)吡咯烷(图2b)或1,3:4,6-二- ø -亚苄基-2,5- -dideoxy-2,5-imino-L-idit(2c)作为手性助剂分别导致自由基反应中的非对映选择性高(“锡法”;方案1)。除去手性助剂得到相应的烷基化富马酸方案2。3b和3c的单晶X射线结构支持导致形成1,4-立体感应模型的论点。