The conversion of simple 1-alkynes to optically active 2-alkyl-cyclopropan-1-ols is conveniently achieved by a simple protocol. The key step is the cyclopropanation of alkenyl boronic esters derived from (+)-diisopropyl L-tartrate and alkenyl boronic acids. It has been found that best yields could be obtained using diazomethane and palladium(II) acetate as catalyst. The systematic investigation of parameters influencing this reaction led to an improvement of the diastereoselectivity of the transformation.
                                    简单的1-
炔烃转化为光学活性的2-烷基-
环丙醇-1的过程可以通过一个简单的方案方便地实现。关键步骤是对源自 (+)-
二异丙基 L-酒石酸盐和烯基
硼酸的烯丙基
硼酸酯进行
环丙烷化。研究发现,使用二氮烷和
醋酸钯(II)作为催化剂可以获得最佳产率。对影响该反应的参数进行系统研究,改善了该转化反应的对映选择性。