Herein, we report a catalytic and stereospecific method for the preparation of enantioenriched α‐hydroxy cyclopropylboronates with control in four contiguous stereocenters. The reaction involves the borylation of readily available allylic epoxides using an inexpensive Cu(I) salt and a commercially available phosphine ligand. High diastereocontrol is achieved and different diastereomers can be selectively prepared. Functionalization of the carbon–boron bond provides access to different enantiomerically enriched trisubstituted cyclopropanes from a common intermediate.

中文翻译：

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烯丙基环氧化合物立体定向合成α-羟基-环丙基硼酸酯

在这里，我们报告了一种催化和立体定向方法，用于制备在四个连续的立体中心具有控制权的对映体富集的α-羟基环丙基硼酸酯。该反应涉及使用廉价的Cu（I）盐和可商购的膦配体使易于获得的烯丙基环氧化物进行硼化。实现了非对映异构体的高度控制，可以选择性地制备不同的非对映异构体。碳-硼键的功能化可从一个常见的中间体中获得不同的对映异构体富集的三取代环丙烷。