Generation of Nonstabilized Thiazolium and 2-Methylthiazolium Methylides
作者:Otohiko Tsuge、Shuji Kanemasa、Satoru Kuraoka
DOI:10.1246/bcsj.58.1570
日期:1985.5
Desilylation of 3-(trimethylsilylmethyl)thiazolium triflates including 2-methyl derivatives with CsF generates the corresponding thiazoliummethylides which are trapped with acetylenic and olefinic dipolarophiles. This paper presents the first example for the generation of nonstabilized thiazoliummethylides including 2-methyl derivatives.
Three-component synthesis of stable ketenimines containing a sulfur group based on a capture profile of a zwitterionic intermediate is described. Thus, the reactions of zwitterions, generated from isocyanide and dialkyl acetylenedicarboxylate, react with alkyl mercaptans in CH2Cl2 to afford ketenimines in good yields. GRAPHICAL ABSTRACT
Carbene and silicon routes as methods for the generation and dipolar cycloaddition reactions of methyl nitrile ylide
作者:Albert. Padwa、John R. Gasdaska、Miguel. Tomas、Nicholas J. Turro、Yuan. Cha、Ian R. Gould
DOI:10.1021/ja00281a046
日期:1986.10
Direct Benzothiophene Formation via Oxygen-Triggered Intermolecular Cyclization of Thiophenols and Alkynes Assisted by Manganese/PhCOOH
作者:Kaisheng Liu、Fan Jia、Hui Xi、Yuanming Li、Xiaojian Zheng、Qiaoxia Guo、Baojian Shen、Zhiping Li
DOI:10.1021/ol400719d
日期:2013.4.19
An intermolecular oxidative cyclization between thiophenols and alkynes for benzothiophene formation has been established. A variety of multifunctional benzothiophenes are synthesized. In addition, we demonstrated that the obtained benzothiophenes can be used for further transformation to give diverse benzothiophene derivatives efficiently and selectively.
Asymmetric hydrogenation of alkyl(vinyl)thioethers: a promising approach to α-chiral thioethers
作者:Alex F. Meindertsma、Michael M. Pollard、Ben L. Feringa、Johannes G. de Vries、Adriaan J. Minnaard
DOI:10.1016/j.tetasy.2007.11.020
日期:2007.12
This paper describes the enantio selective hydrogenation of vinylthioethers. We show that thioether derivatives of maleic esters can be hydrogenated with full conversion and up to 60% ee, and that alpha-thioether cinnamic acids can be hydrogenated in 51% ee with modest conversion. (c) 2007 Elsevier Ltd. All rights reserved.