Organocatalytic Methods for Chemoselective <i>O</i>-<i>tert</i>-Butoxycarbonylation of Phenols and Their Regeneration from the <i>O</i>-<i>t</i>-Boc Derivatives
作者:Sunay V. Chankeshwara、Rajesh Chebolu、Asit K. Chakraborti
DOI:10.1021/jo8013325
日期:2008.11.7
without any side reactions (bromination, addition of CBr3 to a double bond, and formation of symmetrical diaryl carbonates, cycliccarbonates, or carbonic-carbonic anhydrides). The parent phenols are regenerated from the O-t-Boc derivatives by the catalyst system CBr4-PPh3 without affecting other protecting groups (aryl alkyl ether, alkyl ester, and thioacetal) or competitive side reaction such as bromination