Stereoselective Synthesis of Tetra-Substituted Olefins via Addition of Zinc Enolates to Unactivated Alkynes
作者:Masaharu Nakamura、Taisuke Fujimoto、Kohei Endo、Eiichi Nakamura
DOI:10.1021/ol048131i
日期:2004.12.1
[reaction: see text] In the presence of a stoichiometric or catalytic amount of diethylzinc, a beta-aminocrotonamide undergoes sequential addition/isomerization reactions with 1-alkyne to produce, upon hydrolysis, an alpha-alkylidene beta-dicarbonyl compound in a highly stereoselective manner. The method complements the conventional Knoevenagel synthesis of this class of compounds as to the choice
[反应:见正文]在化学计量或催化量的二乙基锌存在下,β-氨基巴豆酰胺与1-炔烃进行顺序加成/异构化反应,水解后生成高度立体选择性的α-亚烷基β-二羰基化合物方式。该方法补充了此类化合物的常规Knoevenagel合成,涉及原料的选择以及产物的范围和立体化学。