An efficient protocol for multicomponent synthesis of spirooxindoles employing L-proline as catalyst at room temperature
作者:Dushyant Singh Raghuvanshi、Krishna Nand Singh
DOI:10.1002/jhet.451
日期:2010.11
An efficient three‐component one‐pot synthesis of medicinally important spirooxindoles is described by the reaction of isatin, malononitrile/ethyl cyanoacetate, and dimedone/barbituric acid using L‐proline as catalyst in ethanol at roomtemperature. This approach is convenient, mild, and affords the products in high yields without the use of chromatography. J. Heterocyclic Chem., (2010).
HIGASHIYAMA KIMIO; OTOMASU HIROTAKA, CHEM. AND PHARM. BULL., 1980, 28, NO 2, 648-651
作者:HIGASHIYAMA KIMIO、 OTOMASU HIROTAKA
DOI:——
日期:——
Synthesis of functionalized chromene and spirochromenes using l -proline-melamine as highly efficient and recyclable homogeneous catalyst at room temperature
commercially cheap l-proline and melamine for the synthesis of chromenes and spirochromenes (spirooxindoles) via multicomponent reactions at room temperature. Systematic studies were conducted in order to achieve desired reactivity and recyclability of the catalyst using various α-amino acids and aromatic amines as donor-acceptor pairs. Among the screened combinations, l-proline and melamine (3:1 ratio;