syn-β-Hydroxyallylic Silanes from Terminal Epoxide α-Lithiation–Silylation and Alkenylation: Application to the Tetrahydrofuran Portion of the Lytophilippines
摘要:
Lithiation-in situ silylation of terminal epoxides using lithium 2,2,6,6-tetramethylpiperidide in combination with phenyldimethyl(or diethyl)silyl chloride provides a direct process for the synthesis of trans-alpha,beta-epoxysilanes, which undergo alpha-ring opening with alkenylcoppers to give syn-beta-hydroxyallylic silanes. The chemistry is applied in an annulation approach to the C-10-C-19 tetrahydrofuran-containing portion of the lytophilippines.
Deprotonation–electrophile trapping of terminal epoxides
作者:David M. Hodgson、Eirene H. M. Kirton、Steven M. Miles、Stéphanie L. M. Norsikian、Nigel J. Reynolds、Steven J. Coote
DOI:10.1039/b502888d
日期:——
Organolithium-induced deprotonation of terminal epoxides in the presence of appropriate diamine ligands allows trapping with a range of electrophiles, yielding functionalised di- and tri-substituted epoxides in good yields and with control of stereochemistry at the epoxide.
Aggregative activation and carbanion chemistry : complex base deprotonation and directed functionalisation of dithioacetals
作者:Philippe Gros、Philippe Hansen、Paul Caubére
DOI:10.1016/s0040-4020(96)00972-6
日期:1996.11
Bis(phenylthio)methane and [1,3]-dithiane were efficiently deprotonated by the NaNH2-Et(OCH2CH2)(2)-ONa complex base. A marked behaviour difference was observed between the sodium carbanion of [1,3]-dithiane and the corresponding lithio-derivative; A ''radicaioid'' mechanism is proposed to explain the results observed. Copyright (C) 1996 Elsevier Science Ltd
US4361662A
申请人:——
公开号:US4361662A
公开(公告)日:1982-11-30
<i>syn</i>-β-Hydroxyallylic Silanes from Terminal Epoxide α-Lithiation–Silylation and Alkenylation: Application to the Tetrahydrofuran Portion of the Lytophilippines
作者:David M. Hodgson、Saifullah Salik
DOI:10.1021/ol3018853
日期:2012.9.7
Lithiation-in situ silylation of terminal epoxides using lithium 2,2,6,6-tetramethylpiperidide in combination with phenyldimethyl(or diethyl)silyl chloride provides a direct process for the synthesis of trans-alpha,beta-epoxysilanes, which undergo alpha-ring opening with alkenylcoppers to give syn-beta-hydroxyallylic silanes. The chemistry is applied in an annulation approach to the C-10-C-19 tetrahydrofuran-containing portion of the lytophilippines.
A simple and efficient method for epoxidation of terminal alkenes
作者:Christophe Copéret、Hans Adolfsson、K. Barry Sharpless
DOI:10.1039/a703542j
日期:——
The use of a catalytic amount of 3-cyanopyridine in the
methyltrioxorhenium catalysed epoxidation of terminal alkenes with aqueous
hydrogen peroxide speeds turnover, which results in the formation of many
functionalized epoxides in high yields.