Bulky diadamantyl aryl phoshine ligands were synthesized and utilized in Buchwald‐Hartwig couplingreactions of sterically demanding ortho‐substituted arylchlorides. The ligands also showed enhanced catalytic activity in the coupling of tosyl hydrazones and aryl halides.
Rhodium(III)-Catalyzed Direct Cyanation of Aromatic C–H Bond to Form 2-(Alkylamino)benzonitriles Using <i>N</i>-Nitroso As Directing Group
作者:Jiawei Dong、Zhongjie Wu、Zhengyi Liu、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.5b01666
日期:2015.12.18
2-(Alkylamino)benzonitriles were synthesized via a rhodium-catalyzed cyanation on the aryl C–H bond and subsequent denitrosation of N-nitrosoarylamines using a removable nitroso as the directing group, in which N-cyano-N-phenyl-p-methylbenzenesulfonamide (NCTS) was used as the “CN” source. Various substituents on the aryl ring and amino group of N-nitrosoarylamines tolerated the reaction, and the corresponding
Imidazoquinoline derivatives of the formula ##STR1## (wherein X may be O or S) provide selective cyclic guanosine 3',5' monophosphate (cGMP)--specific phosphodiesterase (PDE) inhibitory activity. The compounds are useful for treating or ameliorating cardiovascular disease such as thrombosis, angina pectoris, hypertension, heart failure and arterial sclerosis, as well as asthma, impotence and the like.