A room-temperature protocol to access isoquinolines through Ag(i) catalysed annulation of o-(1-alkynyl)arylaldehydes and ketones with NH4OAc: elaboration to berberine and palmatine
A room-temperature protocol to access isoquinolines through Ag(<scp>i</scp>) catalysed annulation of o-(1-alkynyl)arylaldehydes and ketones with NH<sub>4</sub>OAc: elaboration to berberine and palmatine
作者:Virsinha Reddy、Abhijeet S. Jadhav、Ramasamy Vijaya Anand
DOI:10.1039/c4ob02641a
日期:——
A silver catalysed protocol for the synthesis of a wide range of isoquinolines from o-(1-alkynyl)arylaldehydes has been developed under mild conditions and elaborated to the synthesis of berberine and palmatine.
Osmium-Catalyzed 7-endo Heterocyclization of Aromatic Alkynols into Benzoxepines
作者:Alejandro Varela-Fernández、Cristina García-Yebra、Jesús A. Varela、Miguel A. Esteruelas、Carlos Saá
DOI:10.1002/anie.201000455
日期:——
The wizard of Os: Regioselective osmium‐catalyzed 7‐endo heterocyclization of aromaticalkynols affords benzoxepines in good yields. The proposed catalytic cycle involves the key formation of osmium–vinylidene complexes via an alkynyl‐hydride–osmium(IV) complex from the starting alkynol.