Synthesis of 4<i>H</i>-3,1-Benzoxazines, Quinazolin-2-ones, and Quinoline-4-ones by Palladium-Catalyzed Oxidative Carbonylation of 2-Ethynylaniline Derivatives
作者:Mirco Costa、Nicola Della Cà、Bartolo Gabriele、Chiara Massera、Giuseppe Salerno、Matteo Soliani
DOI:10.1021/jo0357770
日期:2004.4.1
presence of catalytic amounts of 10% Pd/C in conjunction with Bu4NI and KF and under 2.4 MPa of a 3:1 mixture of CO and air. Anti and syn 6-exo-dig cyclization modes account for the formation of the two stereoisomers. Isomerization of the vinylpalladium intermediate may occur as well. Formation of a double carbonylation product 7r and of a gem-dimethoxycarbonylation product 6s, whose structures have been