This paper reports our recent results from synthesis of some useful heterocycles, for example oxazolidinones, indoles, and quinoxalinones, by transition metal-catalyzed cascade processes. The scope and limitations of these procedures and the reaction mechanism for formation of the heterocycles are also discussed.
Reaction of dimethyl (Z)-2-butenylene dicarbonate la with primary amines in the presence of [Pd(eta(3)- C3H5)Cl](2) and 1,1'-bis(diphenylphosphino)ferrocene (dppf) produced vinyl-oxazolidone compounds 2 in up to 70% yield. (C) 2000 Elsevier Science Ltd. All rights reserved.
Platinum-Catalyzed Cyclization of N-Allyl Carbamates for the Synthesis of 5-Vinyloxazolidinones
作者:Hyo-Sang Yoon、Ju-Hye Kim、Eun Joo Kang、Hye-Young Jang
DOI:10.1002/ejoc.201101799
日期:2012.4
Platinum-catalyzed addition of the oxygen nucleophile of a carbamate to an allyl bromide was carried out to afford a range of biologically active 5-vinyl-substituted oxazolidinones in good yields. Over the course of the reaction, a platinum complex, SnCl2, and the allyl bromide are assumed to generate an electrophilic allyl-platinum intermediate in the presence of carbamate oxygen nucleophiles. This
Pd(PPh3)4-catalyzed cyclizations of N-allyl(crotyl, or 3-butenyl),N-butenyloxy derivatives and of an allyl(2-butenyloxy) ether give pyrrolidines, piperidines and a tetrahydrofuran in good yields. Hexahydroindoles and octahydroquinolines are thus obtained from the corresponding N-(2- or 3-butenyl),N-(4-acetoxy-2-cyclohexenyl) amides with excellent stereocontrol.