Efficient Synthesis of γ-Keto Esters through Neighboring Carbonyl Group-Assisted Regioselective Hydration of 3-Alkynoates
摘要:
The Au(III)-catalyzed hydration of 3-alkynoates led to a practical one-step synthesis of gamma-keto esters in high yields, through a carbonyl group participation enabled by a favored 5-endodig cyclization. This mild-aqueous ethanol, room temperature, and atom-economical method has been used effectively with a wide range of substrates. Using the same conditions, a 2-alkynoate produced the corresponding beta-keto ester in high yield.
Thermodynamically Favored Aldol Reaction of Propargyl or Allenyl Esters: Regioselective Synthesis of Carbinol Allenoates
作者:Bo Xu、Gerald B. Hammond
DOI:10.1002/anie.200704221
日期:2008.1.11
Efficient Synthesis of γ-Keto Esters through Neighboring Carbonyl Group-Assisted Regioselective Hydration of 3-Alkynoates
作者:Weibo Wang、Bo Xu、Gerald B. Hammond
DOI:10.1021/jo802450n
日期:2009.2.20
The Au(III)-catalyzed hydration of 3-alkynoates led to a practical one-step synthesis of gamma-keto esters in high yields, through a carbonyl group participation enabled by a favored 5-endodig cyclization. This mild-aqueous ethanol, room temperature, and atom-economical method has been used effectively with a wide range of substrates. Using the same conditions, a 2-alkynoate produced the corresponding beta-keto ester in high yield.
A New Convenient Synthesis of Propargylic Fluorohydrins and 2,5-Disubstituted Furans from Fluoropropargyl Chloride
作者:Bo Xu、Gerald B. Hammond
DOI:10.1021/jo0601011
日期:2006.4.1
Fluoropropargyl chloride reacted with carbonyl compounds to give propargylic fluorohydrins under mild conditions and in good yields; however, at higher temperatures and longer reaction times, 2,5-disubstitutedfurans are obtained, also in good yields. Fluorohydrins can be readily oxidized to α-fluoroketones and α-fluorocarboxylic acids with Jones' reagent.