Preparation of Spiro[indene-1,1′-isoindolin]-3′-ones via Sulfuric Acid-Promoted Cascade Cyclization
作者:Lang Sun、Peng Liu、Jing Wang、Ping Lu、Yanguang Wang
DOI:10.1021/acs.joc.7b00958
日期:2017.8.18
The sulfuric acid-promoted cascade cyclization of 2-(3-hydroxyprop-1-ynyl)benzonitriles led to an efficient synthesis of spiro[indene-1,1′-isoindolin]-3′-ones. This class of spiro compounds could also be prepared by the sulfuric acid-catalyzed cyclization of 2-(phenylacryloyl)benzonitriles, which were readily derived from 2-(3-hydroxyprop-1-ynyl)benzamides using trifluoroacetic acid as a catalyst.
硫酸促进的2-(3-羟基丙-1-炔基)苄腈的级联环化导致螺[indene-1,1'-isoindolin] -3'-ones的有效合成。这类螺环化合物也可以通过硫酸催化的2-(苯基丙烯酰基)苄腈的环化反应而制得,所述2-(苯基丙烯酰基)苄腈很容易使用三氟乙酸作为催化剂衍生自2-(3-羟基丙-1-炔基)苯甲酰胺。