Phosphine/Palladium Cooperative Catalysis: (4 + 3) Annulations of Morita–Baylis–Hillman Carbonates and Vinyl Benzoxazinanones
作者:Yue Wang、Siming Jia、Er-Qing Li、Zheng Duan
DOI:10.1021/acs.joc.9b02349
日期:2019.12.6
A novel (4 + 3) annulation reaction of Morita-Baylis-Hillmancarbonates and vinyl benzoxazinanones has been developed by using phosphine/palladium dual catalysis. This reaction demonstrates a wide substrate scope, providing a range of vinyl 2, 3-dihydro-1H-benzo[b]azepine derivatives in moderate to good yields and diastereoselectivities. Experimental results indicate that both palladium and phosphine
Decarboxylative cyclizations and cycloadditions of palladium-polarized aza-ortho-xylylenes
作者:Chao Wang、Nirmal Pahadi、Jon A. Tunge
DOI:10.1016/j.tet.2009.04.071
日期:2009.6
Vinyl benzoxazinones undergo decarboxylation in the presence of palladium catalysts to form palladium-polarized aza-ortho-xylylenes, which are versatile reaction intermediates. These palladium-polarized aza-ortho-xylylenes are generated under exceptionally mild conditions and undergo a plethora of different reactions depending on the reaction conditions. Specifically, they undergo dimerization reactions to produce macrocycles, cyclizations to form dihydroquinolines, cycloadditions with electrophilic p-bonds, and nucleophilic attack by amines. Thus, a wide array of structurally unique aniline derivatives can be accessed from these unique intermediates. (C) 2009 Elsevier Ltd. All rights reserved.