牛血清白蛋白(BSA)通过一锅,醛/酮/ Isatin,丙二腈和3-甲基-1 H-吡唑-5-(4)的三组分反应催化合成二氢吡喃并[2,3- c ]吡唑衍生物在这项工作中,在环境温度下在H 2 O–EtOH(7:3)中形成了H)-1。发现该催化剂可有效地用于醛,酮和靛红,得到相应的二氢吡喃并[2,3- c ]吡唑和螺[吲哚啉-3,4'-吡喃并[2,3- c][吡唑]衍生物的收率很高。BSA对各种醛,芳族/脂肪族酮和取代的isatins表现出广泛的催化混杂性。使用对环境无害的方案,催化剂的可重复使用性,避免使用有害溶剂,优异的收率,易于加工且不会形成副产物,使得BSA成为进一步用作生物催化剂的有吸引力的候选者。
CsF promoted rapid synthesis of spirooxindole‐pyran annulated heterocycles at room temperature in ethanol
作者:Yogesh B. Wagh、Swapnil A. Padvi、Pramod P. Mahulikar、Dipak S. Dalal
DOI:10.1002/jhet.3846
日期:2020.3
straightforward synthetic strategy for the construction of functionalized spirooxindole‐pyranannulatedheterocycles is described. The procedure is based on CsF‐promotedrapid tandem Knoevenagel‐Michael‐Cyclocondensation reaction of isatin, malononitrile, and 4‐hydroxycoumarin/barbituric acids/pyrazolone at roomtemperature in ethanol. This methodology has various advantages like easy operational, excellent
Green Access to Multi-Component Synthesis of Spiropyranopyrazoles
作者:D. Pore、P. Hegade、D. Gaikwad、P. Patil、J. Patil
DOI:10.2174/15701786113106660069
日期:2014.1.31
A catalyst-free multi-component synthesis of spiro[indoline-3,4’-pyrano[2,3-c]pyrazoles] is reported from in
situ formed pyrazolone by exothermic reaction of ethyl acetoacetate with hydrazine hydrate, isatin and malononitrile in
water at room temperature. A suggested mechanistic approach was supported by semi-empirical calculations. The
transformation is carried out in water alone and thus achieved the highest level of green chemistry. Simple reaction
conditions, easy work-up procedure and isolation of products are the auxiliary advantages of present protocol.