Access to Some Angular Aminochromeno[2,3-<i>c</i>]pyrazole Precursors by a Domino Knoevenagel-hetero-Diels-Alder Reaction
作者:Narsidas J. Parmar、Bhavesh R. Pansuriya、Balvantsingh M. Labana、Tushar R. Sutariya、Rajni Kant、Vivek K. Gupta
DOI:10.1002/ejoc.201200751
日期:2012.10
synthesise angular benzopyran-annulated pyrazoles, all of which incorporate a tertiary ring-junction carbon, has been demonstrated. A typical intermediate Knoevenagel heterodiene, formed by the reaction of 2-(alkenyloxy)- or 2-(alkynyloxy)acetophenones with pyrazolones smoothly underwent a subsequent hetero-Diels–Alder reaction to give chromeno-fused pyrazoles in a highly stereoselective reaction. When
Efficient synthesis and biological evaluation of new benzopyran-annulated pyrano[2,3-c]pyrazole derivatives
作者:Balvantsingh M. Labana、Gaurangkumar C. Brahmbhatt、Tushar R. Sutariya、Narsidas J. Parmar、José M. Padrón、Rajni Kant、Vivek K. Gupta
DOI:10.1007/s11030-017-9734-y
日期:2017.5
AbstractA one-pot method has been described to synthesize benzopyran-annulated pyrano[2,3-c]pyrazoles, effectively by combining O-alkenyloxy/alkynyloxy-acetophenones with various pyrazolones in triethylammonium acetate (TEAA) under microwave irradiation. While combination of O-allyloxy- or O-prenyloxy-acetophenones with pyrazolones occurred efficiently, that of O-propargyloxy-acetophenones was found
抽象的已经描述了一种一锅法,通过在微波辐射下,在乙酸三乙铵(TEAA)中将O-烯基氧基/炔基氧基-苯乙酮与各种吡唑啉酮有效地结合,来合成苯并吡喃环化的吡喃并[2,3- c ]吡唑。虽然组合ö -allyloxy-或ö -prenyloxy-苯乙酮与吡唑啉酮有效地发生,即的ö通过多米诺Knoevenagel–杂Diels–Alder(DKHDA)反应,发现在ZnO催化剂存在下,炔丙基氧基苯乙酮是有效的。在酸性介质中,将含硝基的产物与铁(II)串联还原后,还合成了氨基苯并吡喃骨架。测量并讨论了这些化合物对革兰氏阳性,革兰氏阴性和结核分枝杆菌,真菌和各种代表性人类实体瘤细胞系的抗增殖活性,此外还具有降低铁的抗氧化能力。 图形概要