Synthesis of Methyl (<i>Z</i>)-2-Acetamido-3-aryl-2-butenoates in Two Highly Selective Steps
作者:C. Cativiela、M. D. Diaz De Villegas、E. Meléndez
DOI:10.1055/s-1986-31660
日期:——
Diazomethane reacts with methyl (Z)-2-acetamido-3-aryl-2-propenoates regio- and stereospecifically to afford cis-4-aryl-3-acetamido-3-methoxycarbonyl-Î1-pyrazolines which heated in 1,2-ethanediol at 200°C extrude nitrogen to afford stereospecifically methyl (Z)-2-acetamido-3-aryl-2-butenoates in high yields.
重氮甲烷与(Z)-2-乙酰氨基-3-芳基-2-丙烯酸甲酯发生区域和立体反应,生成顺式-4-芳基-3-乙酰氨基-3-甲氧羰基-δ1-吡唑啉,在 1,2-乙二醇中于 200°C 下加热,挤出氮气,以高产率生成立体特定的(Z)-2-乙酰氨基-3-芳基-2-丁烯酸甲酯。