在水介质中通过脱氨基环化反应合成绿色无金属的螺旋稠合的3,4'-吡唑并[4',3':5,6]吡啶[2,3- d ]嘧啶衍生物
摘要:
通过取代的1 H- 吡唑-的靛红的脱氨基环化反应,绿色合成无螺旋合成的3,4'-吡唑并[4',3':5,6]吡啶[2,3- d ]嘧啶衍生物 据报道在水性介质中有5-胺和6-氨基嘧啶-2,4(1 H ,3 H )-二酮或6-氨基-1,3-二甲基嘧啶-2,4(1 H ,3 H )-二酮。这是通过脱氨基环化反应合成目标产物的有效途径。该方法的其他优点是产量高,易于分离,基材范围广和环境友好。
New four-component reactions in water: a convergent approach to the metal-free synthesis of spiro[indoline/acenaphthylene-3,4′-pyrazolo[3,4-b]pyridine derivatives
作者:Kamaraj Balamurugan、Subbu Perumal、J. Carlos Menéndez
DOI:10.1016/j.tet.2011.03.020
日期:2011.5
New four-component domino reactions are described that allow the one-pot synthesis of spiro[indoline/acenaphthylene-3,4'-pyrazolo[3,4-b]pyridine derivatives from the reaction of phenylhydrazine, 3-aminocrotononitrile, isatin/acenaphthylene-1,2-dione, and cyclic 1,3-dicarbonyl compounds, including cyclohexane-1,3-diones, barbituric acid, and 2-thioxodihydropyrimidine-4,6(1H,5H)-dione, in the presence of (+/-)-camphor-10-sulfonic acid (CSA). These processes take place in water and involve the generation of two rings and five new bonds (two C-C, two C-N and one C = N) in a single synthetic operation, with expedient work-up and diminished waste generation due to the absence of extraction and purification steps. (C) 2011 Elsevier Ltd. All rights reserved.