of manganese-catalyzed asymmetric transfer hydrogenation of N-heteroaromatics in water is reported. This ATH reaction proceeds smoothly without the need for inert atmosphere protection in the presence of a water-stable manganese catalyst, which bears an easily available aminobenzimidazole ligand. Ammonia borane, regarded as a green, cheap and high atom economical hydrogensource, was applied. Various
报道了锰催化 N-杂芳烃在水中不对称转移氢化的第一个例子。该 ATH 反应在水稳定的锰催化剂存在下顺利进行,无需惰性气氛保护,该催化剂带有易于获得的氨基苯并咪唑配体。氨硼烷被认为是一种绿色、廉价、高原子经济的氢源。各种喹啉以高产率转化为所需产品,对映体过量 (ee) 高达 99%。当前方案的实用性通过将其应用于汉考克生物碱 (−)-cuspareine 的克级全合成来证明,总产率为 96%。
Brønsted acid differentiated metal catalysis by kinetic discrimination
作者:Magnus Rueping、René M. Koenigs
DOI:10.1039/c0cc02167a
日期:——
A Brønsted acid differentiated metal catalyzed hydrogenation has been developed. A combinatorial variation of chiral triflylamides with achiral metal complexes results in a highly active catalyst for the asymmetric reduction.