Intramolecular C−H Insertion Reactions of Boroxy Fischer Carbene Complexes. Regio- and Diastereoselective Modification of Terpenes
作者:José Barluenga、Félix Rodríguez、Jérôme Vadecard、Maximilian Bendix、Francisco J. Fañanás、Fernando López-Ortiz、Miguel A. Rodríguez
DOI:10.1021/ja991161+
日期:1999.9.1
In-situ-generated dialkylboroxy and diaminoboroxy Fischer carbene complexes lead to oxaborolane or oxazaborolidine derivatives via an intramolecular C−H insertion reaction. Further oxidation of these intermediates yields 1,3-diol or 1,2-amino alcohol derivatives. Diastereoselectivities as high as 99% are reached when starting from boroxy Fischer carbene complexes derived from terpenes, which represents a regio-
原位生成的二烷基硼氧基和二氨基硼氧基 Fischer 卡宾配合物通过分子内 CH 插入反应生成氧杂硼烷或氧杂硼烷衍生物。这些中间体的进一步氧化产生 1,3-二醇或 1,2-氨基醇衍生物。当从萜烯衍生的硼氧基 Fischer 卡宾配合物开始时,非对映选择性高达 99%,这代表了此类天然产物的区域和非对映选择性修饰。研究了Cβ取代基相对于硼原子对反应路径的影响,并在核磁共振鉴定中间体后提出了机理。此外,理论计算表明存在硼-金属相互作用,这可能是 C-H 插入反应的关键步骤。