[Rh2(MEPY)4] is a versatile catalyst for asymmetric synthesis but its preparation requires purification by chromatography on surface-modified silica. A higher yielding procedure based on a more convenient work-up is presented herein. Moreover, a much improved method for the preparation of [BiRh(OTfa)4] is described, which makes this heterobimetallic complex readily available. Subsequent exchange of
[Rh 2 (MEPY) 4 ] 是一种用于不对称合成的通用催化剂,但其制备需要通过表面改性
二氧化硅色谱纯化。本文提出了基于更方便的后处理的更高产率的程序。此外,还描述了一种大大改进的 [BiRh(OTfa) 4 ]制备方法,这使得这种异质双
金属配合物易于获得。随后
三氟乙酸酯
配体的交换打开了获得迄今为止未被充分认识的(手性)桨轮复合物家族的途径。虽然包含四个
羧酸盐
配体的 [BiRh] 配合物非常适合分子间不对称
环丙烷化反应,但 [BiRh(MEPY) 4 ] 作为 [Rh 2 (MEPY)的异双
金属表亲4 ] 出人意料地反应迟钝;DFT 计算揭示了这种惯性的原因。