Addition of terminal alkynes to α-ketone esters to synthesize α-tertiary-hydroxy esters promoted by zinc and an alkyl halide
作者:Wen Zhang、Yuan Cao、Wei Chen、Gang Zhao、Lin Pu
DOI:10.1016/j.tetlet.2015.09.144
日期:2015.11
A convenient method to synthesize various alpha-tertiary-hydroxy esters at room temperature has been developed. This method uses the readily available and inexpensive Zn powder in combination with an alkyl halide to promote the addition of alkynes to alpha-ketone esters with no need to exclude air or moisture. It has also been extended to promote the reaction of alkynes with a variety of aldehydes and other electron-deficient ketones. (C) 2015 Elsevier Ltd. All rights reserved.
Observations on the Synthesis and Carbocyclisation Reactions of 6-Oxohexa-2,3-dienoates
prepared via an atom economical Claisen rearrangement of propargyl vinyl ethers formed in situ by the reaction of propargylic alcohols with acetals. Preliminary experiments have demonstrated that these functionalised allenic esters undergo a facile amine-induced carbocyclisation under mild reaction conditions, yielding densely functionalised cyclopentanones containing chiral quaternary carbon centres