Do the Electronic Effects of Sulfur Indeed Control the π-Selectivity of γ-Sulfenyl Enones? An Investigation
摘要:
The electronic effects of sulfur in gamma-sulfenyl enones are not transmitted to the carbonyl carbon through the pi bond as reported previously. The diastereoselectivity is rather controlled by a combination of several other factors. The steric effects arising from the substituents on the sulfur atom and the gamma-carbon and the bulk of the nucleophile constitute the major control elements.
Stannyl Radical-Mediated Cleavage of π-Deficient Heterocyclic Sulfones. Synthesis of α-Fluoro Esters
作者:Stanislaw F. Wnuk、Jeannette M. Rios、Jahanzeb Khan、Ya-Li Hsu
DOI:10.1021/jo000342n
日期:2000.6.1
1 h under these conditions. This represents a mild new methodology for removal of the synthetically useful sulfone moiety. Substitution of Bu(3)SnD for Bu(3)SnH gave access to alpha-deuterium-labeled esters. Treatment of the alpha-(pyrimidin-2-ylsulfonyl) enolates derived from several esters with Selectfluor gave high yields of the 2-fluoro-2-(pyrimidin-2-ylsulfonyl)alkanoates, which were smoothly
Sulfenylation Accompanied by Dealkoxycarbonylation of β-Keto Esters, Geminal Diesters, and α-Cyano Ester in Hexamethylphosphoric Triamide (HMPA)
作者:Morio Asaoka、Kazutoshi Miyake、Hisashi Takei
DOI:10.1246/bcsj.51.3008
日期:1978.10
In the presence of sodium iodide, diphenyl disulfide reacted with geminal diesters, β-keto esters, and α-cyano esters in hexamethylphosphoric triamide (HMPA) at 150–160 °C to give alkyl phenyl sulfides and α-phenylthio esters, ketones, and nitriles, respectively, along with evolution of carbon dioxide.
在碘化钠存在下,二苯基二硫化物在 150-160 °C 的温度下与六甲基三磷酰胺 (HMPA) 中的宝石二酯、β-酮酯和α-氰酯发生反应,分别生成烷基苯基硫化物和α-苯基硫代酯、酮和腈,同时产生二氧化碳。
Solid-Liquid Phase Transfer Catalytic Synthesis. XI. The Convenient and Efficient Alkylation of Ethyl Phenylmercapto-Acetate in the Presence of Quaternary Ammonium Salts Under Microwave Irradiation
作者:Runhua Deng、Yuliang Wang、Yaozhong Jiang
DOI:10.1080/00397919408010199
日期:1994.7
Abstract The rapid alkylation of ethyl phenylmercapto—acetate with a series of halides was performed in 650W domestic microwave oven to yield the alkylated products in 58 to 83%.
Stannyl Radical-Mediated Cleavage of π-Deficient Heterocyclic Sulfones. Synthesis of α-Fluoro Esters and the First Homonucleoside α-Fluoromethylene Phosphonate<sup>1</sup>
作者:Stanislaw F. Wnuk、Morris J. Robins
DOI:10.1021/ja953513s
日期:1996.1.1
Do the Electronic Effects of Sulfur Indeed Control the π-Selectivity of γ-Sulfenyl Enones? An Investigation
作者:Veejendra K. Yadav、K. Ganesh Babu、Masood Parvez
DOI:10.1021/jo034608c
日期:2004.5.1
The electronic effects of sulfur in gamma-sulfenyl enones are not transmitted to the carbonyl carbon through the pi bond as reported previously. The diastereoselectivity is rather controlled by a combination of several other factors. The steric effects arising from the substituents on the sulfur atom and the gamma-carbon and the bulk of the nucleophile constitute the major control elements.