Shedding light on azides: [Ru(TPP)CO] (TPP=tetraphenyl porphyrin dianion), white light and O2 were found to be a suitable catalyst combination to perform the annulation of several biaryl azides (see scheme). The high chemoselectivity of the process allows the synthesis of phenanthridines and dihydrophenanthridines in good yield and purity.
Asymmetric Hydrogenation of Phenanthridines with Chiral Boranes
作者:Guangyu Cui、Xiangqing Feng、Haifeng Du
DOI:10.1002/cjoc.202300588
日期:2024.3.15
The asymmetrichydrogenation of N-heteroarenes provides an efficient method for the synthesis of optically active cyclic secondary amines. In this paper, we described an asymmetrichydrogenation of phenanthridines using a chiral mono-alkene-derived borane. A variety of dihydrophenanthridines were furnished in high yields with up to 93% ee. The current catalytic system was very sensitive for the steric