The direct amination of benzoxazoles at C2 using N-heterocycles as nitrogen sources has been developed for the first time. Several kinds of inexpensive oxidants and also electricity were effective for this transformation in the presence of 2,2,6,6-tetramethylpiperidine-N-oxyl. This metal-free and operationally simple reaction can afford a variety of important C,N′-linked bis-heteocycles in moderate
Phosphine-Catalyzed Dearomative [3 + 2] Cycloaddition of Benzoxazoles with a Cyclopropenone
作者:Xingben Wang、Congjun Yu、Iuliana L. Atodiresei、Frederic W. Patureau
DOI:10.1021/acs.orglett.1c04045
日期:2022.2.11
The triphenylphosphine-catalyzed dearomative [3 + 2] cycloaddition of benzoxazoles with 1,2-diphenylcyclopropenone is herein described. The reaction scope, mechanism, and possible future applications of this rare organocatalyzed cycloaddition are herein discussed.