A simple and general preparation of vinylic sulfides, selenides and tellurides
作者:Claudio C. Silveira、Paulo Cesar S. Santos、Samuel R. Mendes、Antonio L. Braga
DOI:10.1016/j.jorganchem.2008.09.039
日期:2008.12
A general method for the synthesis of vinylic chalcogenides by nucleophilic and Ni-catalyzed vinylic substitution on vinylichalides by phenyl chalcogenolates is described. The reactions were regio and stereoselective for the nickel catalyzed substitution, and mixture of isomers was observed for some examples in the thermal process in DMF.
Vinyl radical generation with selenoborane and its application to cyclization reaction of enynes
作者:Tadashi Kataoka、Mitsuhiro Yoshimatsu、Hiroshi Shimizu、Mikio Hori
DOI:10.1016/s0040-4039(00)97996-6
日期:1990.1
Tris(methylseleno)- and tris(phenylseleno)boranes added to acetylenes to afford methylseleno- and phenylseleno-substituted -vinylselenides in high yields. The addition reactions proceeded by way of free radicals and were applied to cyclization reactions of enyne compounds. The radical cyclization provided pyrrolidine derivatives diastereoselectively.
Hydroselenation of alkynes using NaBH4/BMIMBF4: easy access to vinyl selenides
作者:Eder J. Lenardão、Luiz G. Dutra、Maiara T. Saraiva、Raquel G. Jacob、Gelson Perin
DOI:10.1016/j.tetlet.2007.09.042
日期:2007.11
A general and easy method for the synthesis of several vinyl selenides using NaBH4 and BMIMBF4 as a recyclable solvent is described. This efficient and improved method furnishes the corresponding vinyl chalcogenides preferentially with Z configuration. We also observed that when the same protocol was applied to phenyl acetylene, (E)-bis-phenylseleno styrene was obtained in good yield and with high selectivity. (c) 2007 Elsevier Ltd. All rights reserved.