The Lewis acid-catalyzed intramolecularsubstitutionreactions of 4-vinyloxy- or 4-acyloxy-azetidin-2-ones with nitrogen-bound allyl-, propargyl- and vinyl-silanes leading to the carbacephams or carbacephems, are reported. The formation of carbapenams was not observed. To illustrate the potential of these reactions to be carried out under solid-phase conditions, a synthesis of diastereomeric 5-vinyl-carbacephams
Pd‐Catalyzed Asymmetric 5‐exo‐trig Cyclization/Cyclopropanation/Carbonylation of 1,6‐Enynes for the Construction of Chiral 3‐Azabicyclo[3.1.0]hexanes
作者:Qiuyu Li、Yunchu Zhang、Pengyun Liu、Jing Zhong、Baihui Gong、Hequan Yao、Aijun Lin
DOI:10.1002/anie.202211988
日期:2023.1.23
A palladium-catalyzed asymmetric 5-exo-trig cyclization/cyclopropanation/carbonylation of 1,6-enynes has been realized. This reaction provided an efficient method to access a variety of chiral 3-azabicyclo[3.1.0]hexanes with two adjacent quaternary carbon stereocenters in good efficiency.
Ni-Catalyzed Cross Coupling of Alkoxide-Containing Vinyl Halides with Grignard Reagents. A “One-Pot” Synthesis of 2-[(Trimethylsilyl)methyl]-2-propen-1-yl Acetate