Carbonyl transposition on organoselenium compounds
作者:João V. Comasseto、Wai L. Lo、Nicola Petragnani
DOI:10.1016/s0040-4020(97)00454-7
日期:1997.6
Carbonyl conjugated vinylic selenides undergo 1,3 and 1,5-carbonyl transposition sequences through organometallic reagents addition reactions followed by acid hydrolysis.
Treatment of diphenyl diselenide with tributylphosphine in an alkaline medium forms phenylselenolate ion which converts alkyl halides, α,β-unsaturated ketones, and epoxides into alkyl selenides, (phenylseleno)alkenones, and β-(phenylseleno) alkanols, respectively, in high yield. Selenation of 3α-bromocholestane gives 3β-(phenylseleno)cholestane with complete inversion of the configuration.
Stereoselective synthesis of vinylic chalcogenides through vinylic substitution by lithium organylchalcogenolates
作者:C.C. Silveira、R.B. Guerra、J.V. Comasseto
DOI:10.1016/j.tetlet.2007.05.074
日期:2007.7
Enol phosphates and enol tosilates of P-dicarbonyl compounds react with lithium organoselenolates to give beta-organo-seleno (Z) -alpha,beta-unsaturated carbonyl compounds. Tetrasubstituted vinylic vic-bis(organylchalcogenides) of (E)-geometry have been prepared by this method. (C) 2007 Elsevier Ltd. All rights reserved.
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