TiCl4 promoted reaction of aldehydes with 1,5-dienyl allylsilanes: addition accompanied by cyclization
摘要:
TiCl4 readily promotes the addition of 1,5-dienyl allylsilanes to aliphatic aldehydes with concomitant cyclization to afford 1,3-cis-disubstituted methylenecyclohexanes with remarkable stereoselectivity. The trimethylsilyl group exerts a strong activating and directing influence on the regioselectivity and stereoselectivity of this biomimetic cyclization. (C) 2000 Elsevier Science Ltd. All rights reserved.
A simple and efficient enantioselective synthesis of γ-cyclohomocitral, a key and versatile intermediate for the synthesis of some monocyclofarnesane terpenoids, is described. This features a highly sitoselective Sharpless asymmetric didydroxylation of a homomonoterpene diolefin. The first enantioselective synthesis of (−)-ancistrodial and (−)-pallescensone were accomplished. The (S)- configuration
Stereoselective Construction of Functionalized, Trisubstituted (<i>Z</i>)-Allylsilanes and (<i>Z</i>)-Iodoalkenes
作者:Paul V. Fish
DOI:10.1080/00397919608003634
日期:1996.2
Methodology for the stereoselectiveconstruction of functionalized, trisubstituted (Z)-allylsilanes and (Z)-iodoalkenes has been developed.
已经开发了功能化的三取代 (Z)-烯丙基硅烷和 (Z)-碘代烯烃的立体选择性构建方法。
TiCl4 promoted reaction of aldehydes with 1,5-dienyl allylsilanes: addition accompanied by cyclization
作者:Giovanni Vidari、Maria Pia Bonicelli、Luigi Anastasia、Giuseppe Zanoni
DOI:10.1016/s0040-4039(00)00400-7
日期:2000.4
TiCl4 readily promotes the addition of 1,5-dienyl allylsilanes to aliphatic aldehydes with concomitant cyclization to afford 1,3-cis-disubstituted methylenecyclohexanes with remarkable stereoselectivity. The trimethylsilyl group exerts a strong activating and directing influence on the regioselectivity and stereoselectivity of this biomimetic cyclization. (C) 2000 Elsevier Science Ltd. All rights reserved.