Base-Catalyzed Highly Stereoselective Conversion of γ-Hydroxy-α,β-acetylenic Esters to γ-Acetoxy Dienoates
作者:Yang Yue、Xiao-Qi Yu、Lin Pu
DOI:10.1002/chem.200802355
日期:2009.5.11
A convenient route with high stereo control to γ‐acetoxy dienoates is provided by the reaction of methyl propiolate with aldehydes in the presence of ZnEt2 and N‐methylimidazole at room temperature, followed by the catalytic conversion of the resulting γ‐hydroxy‐α,β‐acetylenic esters with p‐N,N‐dimethylaminopyridine (DMAP) in acetic anhydride (see scheme).
在室温下,在ZnEt 2和N-甲基咪唑存在下,丙酸甲酯与醛反应,然后催化生成的γ-羟基-α,可实现对γ-乙酰氧基二烯酸酯的高度立体控制的便捷途径。在乙酸酐中带有p-N,N-二甲基氨基吡啶(DMAP)的β-炔属酯(参见方案)。