Preparation of α-(2,2-Diphenylhydrazino)lactones and Related Compounds by Radical Cyclization: Use of Glyoxylic Acid Hydrazone Derivatives
作者:Derrick L. J. Clive、Junhu Zhang、Rajendra Subedi、Virginie Bouétard、Sheldon Hiebert、Robert Ewanuk
DOI:10.1021/jo0013655
日期:2001.2.1
the corresponding O-benzyloxime (2b) are easily esterified in high yield by beta-bromo alcohols. The resulting esters undergo radical cyclization to alpha-(2,2-diphenylhydrazino)- or alpha-[(phenylmethoxy)amino]lactones on treatment with tributyltin hydride. Esters for radical cyclization were also made using a beta-(phenylseleno) alcohol and an enol ether. Several derivatives of glyoxylic acid were