Selenium stabilized carbenium ions bis(selend)- andbis(thio)-alkylation of ketones and aldehydes
作者:L. Hevesi、K.M. Nsunda
DOI:10.1016/s0040-4039(00)99040-3
日期:——
RAO, CH. SRINIVASA;CHAKRASALI, R. T.;ILA, HIRIYAKKANAVAR;JUNJAPPA, HIRIYA+, TETRAHEDRON, 46,(1990) N, C. 2195-2204
作者:RAO, CH. SRINIVASA、CHAKRASALI, R. T.、ILA, HIRIYAKKANAVAR、JUNJAPPA, HIRIYA+
DOI:——
日期:——
HEVESI, L.;NSUNDA, K. M., TETRAHEDRON LETT., 1985, 26, N 52, 6513-6514
作者:HEVESI, L.、NSUNDA, K. M.
DOI:——
日期:——
Cycloaromatization of α-oxoketene dithioacetals and β-oxodithioacetals with benzyl-,1-(naphthylmethyl) and 2-(naphthylmethyl)magnesium halides: Synthesis of condensed polynuclear aromatic hydrocarbons
作者:Ch.Srinivasa Rao、Maliakel P Balu、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1016/s0040-4020(01)86411-5
日期:1991.1
An efficient route for the synthesis of substituted naphthalenes, phenanthrenes and other polynuclear aromatic hydrocarbons has been developed. The methodology involves 1,2- (or sequential 1,4- and 1,2-) addition of either benzyl, 1-(naphthylmethyl) or 2-(naphthylmethyl) magnesium halides to α-oxoketenedithioacetals or β-oxodithioacetals followed by borontrifluoride etherate catalyzed cycloaromatization
Theα-oxoketene dithioacetals are shown to undergo conjugate 1,4-reduction in highly regio- and chemoselective manner with sodium borohydride in acetic acid to afford the corresponding β-oxodithioacetals in good yields. These results have been rationalized according to HSAB principle in terms of 'hard soft affinity inversion' concept. The reduction of with sodium cyanoborohydride also proceeds in 1