Catalytic Atropenantioselective Heteroannulation between Isocyanoacetates and Alkynyl Ketones: Synthesis of Enantioenriched Axially Chiral 3-Arylpyrroles
作者:Sheng-Cai Zheng、Qian Wang、Jieping Zhu
DOI:10.1002/anie.201812654
日期:2019.1.28
We report herein the first examples of catalytic enantioselective synthesis of axiallychiral 3‐arylpyrroles. Reaction of α‐isocyanoacetates with β‐aryl‐α,β‐alkynic ketones in the presence of silver oxide and a phosphine ligand derived from Cinchona alkaloid occurred chemoselectively to afford enantioenriched 3‐arylpyrroles in high yields with excellent enantiomeric excesses. The pyrrole ring was constructed
The Diels–Alder cycloaddition reaction of tetracyclone and functionalized, internal aryl acetylenes gave access to a number of bulky atropisomeric biaryls in good to excellent yield. The synthesis is convenient and yields the pure biaryls without tedious work-up and purification procedures. Exemplarily the atropisomers have been resolved via the diastereomers in an easy and efficient manner to yield