Synthesis of 3,3-diphenyl-3H-pyrazoles applying vinyl sulfones as chemical equivalents of acetylenes in reaction of 1,3-dipolar cycloaddition to diphenyldiazomethane
作者:V. A. Vasin、V. V. Razin、E. V. Bezrukova、D. Yu. Korovin、P. S. Petrov、N. V. Somov
DOI:10.1134/s1070428015080138
日期:2015.8
α-bromovinyl phenyl sulfones and a-bromovinyl methyl sulfones with diphenyldiazomethane afforded the corresponding 3-bromo- 5,5-diphenyl-3-sulfonyl-Δ1-pyrazolines. The first among them at 20°C suffered spontaneous elimination of molecular nitrogen and converted into 1-bromo-2,2-diphenyl-1-(phenylsulfonyl)cyclopropane whose structure was established by X-ray diffraction analysis. The action of DBU on another
乙烯基苯基砜,甲基(ë)-3-(苯基磺酰基) -甲基和(ë)-3-(p甲苯磺酰基)丙烯酸酯,(ë)-3-(苯基磺酰基) -和(ë)-3-(p -甲苯磺酰基)丙烯腈在乙醚在20℃下反应与二苯基重氮甲烷,导致相应的5,5-二苯基-3-(芳基磺酰基)的形成- Δ 2 -pyrazolines。在0℃下用DBU在二氯甲烷中用DBU处理时,含有甲氧基羰基或氰基的产物遭受脱氢磺化作用,并转化为4-取代的3,3-二苯基-3 H-吡唑。所提到的Δ的氧化2在20℃下,用活化的二氧化锰在苯中生成吡唑啉,分别形成4-甲氧基羰基-和4-氰基取代的5-芳基磺酰基-3,3-二苯基-3 H-吡唑。α溴乙烯基苯基砜和α-溴乙烯基甲基砜与二苯基重氮甲烷反应,得到相应的3-溴- 5,5-二苯基-3-磺酰-Δ 1 -pyrazolines。它们中的第一个在20°C时会自发消除分子氮,并转化为1-bromo-2,2-二苯基-1-