Divergent Syntheses of 2-Aminonicotinonitriles and Pyrazolines by Copper-Catalyzed Cyclization of Oxime Ester
摘要:
Copper-catalyzed cyclization of an oxime ester toward divergent heterocycle synthesis is reported. Oxime ester serves as an enamine precursor to cyclize with malononitrile and aldehydes for access to 2-aminonicotinonitriles in a one-pot reaction, while cyclizing with N-sulfonylimines leads to synthesis of pyrazolines.
Divergent Syntheses of 2-Aminonicotinonitriles and Pyrazolines by Copper-Catalyzed Cyclization of Oxime Ester
作者:Qifan Wu、Yan Zhang、Sunliang Cui
DOI:10.1021/ol500094w
日期:2014.3.7
Copper-catalyzed cyclization of an oxime ester toward divergent heterocycle synthesis is reported. Oxime ester serves as an enamine precursor to cyclize with malononitrile and aldehydes for access to 2-aminonicotinonitriles in a one-pot reaction, while cyclizing with N-sulfonylimines leads to synthesis of pyrazolines.
Synthesis of alkynyl/alkenyl-substituted pyridine derivatives via heterocyclization and Pd-mediated Sonogashira/Heck coupling process in one-pot: a new MCR strategy
作者:Mohan Reddy Bodireddy、N. C. Gangi Reddy、Sangita D. Kumar
DOI:10.1039/c4ra01053a
日期:——
NH4OAc (4) and a series of terminal alkynes (5)/alkenes (8) in the presence of pyrrolidine and Pd-catalyst in a mixture of H2O–DME (1 : 4 ratio) under reflux conditions in a single step. The Heck-type coupling with terminal olefins takes place stereoselectively with exclusive formation of E-isomers. This new MCR strategy opens new avenues in the development of (i) a diversity-oriented new cyanopyridine