Efficient and convenient synthesis of spiroindolinone-quinazolines induced by stannous chloride
作者:Yu Hu、Man-Man Wang、Hui Chen、Da-Qing Shi
DOI:10.1016/j.tet.2011.09.130
日期:2011.12
An efficient, convenient, one-potsynthesis of 1′H-spiro[indoline-3,2′-quinazoline]-2,4′(3′H)-dione derivatives was accomplished in good yields via the novel reductive cyclization of 2-nitrobenzamides and isatins mediated by SnCl2·2H2O system. A variety of substrates can participate in the process with good yields, making this methodology have broad applicability. The structure of compound 3c has been
We describe an unprecedented dual C-H functionalization of indolin-2-one via an oxidative C(sp3)-H/N-H/X-H (X = N, C, S) cross-coupling protocol, which is catalyzed by a simple iron salt under mild and ligand-free conditions and employs air (molecular oxygen) as the terminal oxidant. This method is readily applicable for the construction of tetrasubstituted carbon centers from methylenes and provides