Allyldimethyltritylsilane. Synthesis of Cyclopentanols, Oxetanes, and Tetrahydrofurans by Reaction with Electron Deficient Olefins
摘要:
Allyldimethyltritylsilane (ADTS, 1) has been employed to access a variety of cyclopentanols via Lewis acid mediated annulation to electron deficient olefins. The intermediate silylcyclopentanes were converted to their respective cyclopentanols under mild, nonepimerizing oxidative conditions. In addition, ADTS undergoes efficient annulation onto aldehydes to provide oxetanes and tetrahydrofurans. Same preliminary investigations of this annulation to chiral nonracemic bicyclic lactams are presented.
Stereoselective Synthesis of Tetrahydropyrans via Formal [4 + 2]-Cycloaddition: A Comparison of Allylsilane and Crotylsilane
作者:Steven R. Angle、Dominique S. Belanger、Nahla A. El-Said
DOI:10.1021/jo0203342
日期:2002.11.1
two diastereomers with allylsilane, but only a single diastereomer was observed in the case of crotylsilanes. The reaction time for crotylsilanes was longer than that for allylsilanes likely due to the increased steric hindrance. Allylsilanes afforded tetrahydropyrans in 34-67% yields, and crotylsilanes provided products in 0-62% yields.
Stereoselective Synthesis of Tetrahydropyrans via a Formal [4 + 2]-Cycloaddition of Allylsilanes
作者:Steven R. Angle、Nahla A. El-Said
DOI:10.1021/ja991861e
日期:1999.11.1
Allyldimethyltritylsilane: construction of enantiomerically pure cyclobutano[c]fused pyrrolidines
作者:Michael D Groaning、Gregory P Brengel、A.I Meyers
DOI:10.1016/s0040-4020(01)00083-7
日期:2001.3
Cyclobutannulation of the bicyclic lactam with allyldimethyltritylsilane is accomplished in high yield with good diastereoselectivity. The resulting tricyclic system is converted to a enantiomerically pure cyclobutane-fused pyrrolidine. (C) 2001 Elsevier Science Ltd. All rights reserved.
Allyldimethyltritylsilane. Synthesis of Cyclopentanols, Oxetanes, and Tetrahydrofurans by Reaction with Electron Deficient Olefins
作者:Michael D. Groaning、Gregory P. Brengel、A. I. Meyers
DOI:10.1021/jo9805652
日期:1998.8.1
Allyldimethyltritylsilane (ADTS, 1) has been employed to access a variety of cyclopentanols via Lewis acid mediated annulation to electron deficient olefins. The intermediate silylcyclopentanes were converted to their respective cyclopentanols under mild, nonepimerizing oxidative conditions. In addition, ADTS undergoes efficient annulation onto aldehydes to provide oxetanes and tetrahydrofurans. Same preliminary investigations of this annulation to chiral nonracemic bicyclic lactams are presented.
Tritylallyldimethylsilane−TiCl<sub>4</sub> Annulations to Electron Deficient Olefins. Diastereomerically Pure 3-Substituted and 3,4-Disubstituted Cyclopentanols