Mild halogenation of stabilized ester enolates by cupric halides
摘要:
The reactions of various stabilized ester enolates of 2-keto, 2-(alkoxycarbonyl), 2-phosphoryl, and 2-(benzenesulfonyl) esters with cupric chloride or cupric bromide have been examined. The reactions lead to 2-halo esters in good to excellent yields under mild condition. Enolates which contain an unsaturated functionality such as a double bond, a triple bond, or an allylic or a benzylic moiety react with high chemoselectivity.
Gozman,I.P., Journal of general chemistry of the USSR, 1969, vol. 39, p. 1916 - 1922
作者:Gozman,I.P.
DOI:——
日期:——
Shi Xiao-Xin, Dai Li-Xin, J. Org. Chem., 58 (1993) N 17, S 4596-4598
作者:Shi Xiao-Xin, Dai Li-Xin
DOI:——
日期:——
Mild halogenation of stabilized ester enolates by cupric halides
作者:Xiaoxin Shi、Lixin Dai
DOI:10.1021/jo00069a020
日期:1993.8
The reactions of various stabilized ester enolates of 2-keto, 2-(alkoxycarbonyl), 2-phosphoryl, and 2-(benzenesulfonyl) esters with cupric chloride or cupric bromide have been examined. The reactions lead to 2-halo esters in good to excellent yields under mild condition. Enolates which contain an unsaturated functionality such as a double bond, a triple bond, or an allylic or a benzylic moiety react with high chemoselectivity.
Integration of a Four-Step Reaction into One-Pot under the Coexistence of Silica-Gel-Supported Acid and Base Reagents: Synthesis of Benzo- and Naphthothiophenes Using NaHSO4/SiO2 and Na2CO3/SiO2
reaction proceeded efficiently by introduction of starting materials and reagents in a single reaction vessel. The starting materials were very easy to handle and unpleasant smell of aryl thiols that were used in conventional methods could be avoided. Novel thirty-nine benzo- and naphthothiophenes were synthesized by this method in excellent to fair yields. A four-step synthesis of benzo- and naphthothiophenes