Tin powder-promoted one-pot synthesis of 3-spiro-fused or 3,3′-disubstituted 2-oxindoles
作者:Juanjuan Wang、Danfeng Huang、Ke-Hu Wang、Xiansha Peng、Yingpeng Su、Yulai Hu、Ying Fu
DOI:10.1039/c6ob01487a
日期:——
oxindoles has been developed from one-pot reactions of isatins, hydrazides or aromatic amines, 2-(bromomethyl)acrylic ester and tin powder in the presence of a catalytic amount of Brønsted or Lewis acid. The method avoids the use of toxic stannanes and allows easy operation. It is also proved that hydrazides are more favorable for intramolecular cyclization than amines.