Synthesis of 3-thienyl substituted 2-pyrazolines by 1,3-dipolar cycloaddition
作者:M. M. Krayushkin、M. A. Kalik、S. A. Voznesensky
DOI:10.1007/bf00699146
日期:1994.1
have been prepared in high yields by the reaction of substituted,N-(P;-nitrophenyl)-3-thiophenecarbohydrazonoyl chlorides with Et3N in CH2Cl2 in the presence of an excess of a monosubstituted olefin. The reaction probably occurs as 1,3-dipolarcycloaddition of the corresponding 3-thiophenecarbonitrile imines formedin situ at the double bond of the olefin.