Stereoselective Synthesis of Z-α,β-Unsaturated Sulfones Using Peterson Reagents
摘要:
New Peterson reagents were prepared by introducing alkyloxy groups on the silicon atom in order to fix the conformation of the sulfone anion. The reagents 1d and 1e reacted with a variety of aldehydes after the treatment with Li-base to give Z-alpha,beta-unsaturated sulfones with up to >99:1 selectivity in good to excellent yields. For the reaction with aliphatic aldehydes, CPME (cyclopentyl methyl ether) is the choice of solvent, while DME (1,2-dimethoxyethane) gave higher selectivity for the reaction with aromatic aldehydes.
Reactions of alkylmercurials with heteroatom-centered acceptor radicals
作者:Glen A. Russell、Preecha. Ngoviwatchai、Hasan I. Tashtoush、Anna. Pla-Dalmau、Rajive K. Khanna
DOI:10.1021/ja00219a030
日期:1988.5
En particulier, reactivite relative de chlorures d'alkylmercures vis-a-vis de PhS • , PhSe • et I • generes a partir du disulfure de phenyle, diseleniure de phenyle et du β-iodo styrene ou du (diphenyl-1,1 iodo-2) ethylene
En 特别,反应性相对于 de PhS • , PhSe • et I • 与 de PhS • , PhSe • et I • 属 a partir du disulfure de phenyle, diseleniure de phenyle et du β-iodo 苯乙烯 ou du (diphenyl-1,1 iodo -2) 乙烯
Stereoselective Synthesis of <i>Z</i>-α,β-Unsaturated Sulfones Using Peterson Reagents
New Peterson reagents were prepared by introducing alkyloxy groups on the silicon atom in order to fix the conformation of the sulfone anion. The reagents 1d and 1e reacted with a variety of aldehydes after the treatment with Li-base to give Z-alpha,beta-unsaturated sulfones with up to >99:1 selectivity in good to excellent yields. For the reaction with aliphatic aldehydes, CPME (cyclopentyl methyl ether) is the choice of solvent, while DME (1,2-dimethoxyethane) gave higher selectivity for the reaction with aromatic aldehydes.