A Mild Anionic Method for Generating <i>o-</i>Quinone Methides: Facile Preparations of <i>Ortho</i>-Functionalized Phenols
作者:Ryan M. Jones、Ryan W. Van De Water、Christopher C. Lindsey、Christophe Hoarau、Thay Ung、Thomas R. R. Pettus
DOI:10.1021/jo001752e
日期:2001.5.1
A low-temperature method for generating o-quinone methides is described which permits facile introduction of assorted R substituents onto the aryl ring system at low temperature. The method is useful for the efficient preparation of ortho-ring-alkylated phenols.
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