Rhodium-Catalyzed anti-Markovnikov Addition of Secondary Amines to Arylacetylenes at Room Temperature
作者:Kazunori Sakai、Takuya Kochi、Fumitoshi Kakiuchi
DOI:10.1021/ol201453h
日期:2011.8.5
An efficient method for synthesis of E-enamines by the anti-Markovnikov addition of secondary amines to terminal alkynes is described. The reaction of a variety of aryl- and heteroarylacetylenes proceeded at room temperature using a combination of a 8-quinolinolato rhodium complex and P(p-MeOC6H4)(3) as a catalyst. The products were obtained as enamines by simple bulb-to-bulb distillation.
Catalytic Reductive Dehydration of Tertiary Amides to Enamines under Hydrosilylation Conditions
作者:Alexey Volkov、Fredrik Tinnis、Hans Adolfsson
DOI:10.1021/ol403302g
日期:2014.2.7
Tertiary amides are efficiently reduced to their corresponding enamines under hydrosilylation conditions, using a transition-metal-free catalytic protocol based on t-BuOK (5 mol %) and (MeO)(3)SiH or (EtO)(3)SiH as the reducing agent. The enamines were formed with high selectivity in good-to-excellent yields.
Anti-Markovnikov Functionalization of Olefins: Rhodium-Catalyzed Oxidative Aminations of Styrenes
The development of an efficient protocol for the reductivefunctionalization of amides into pyrimidinediones and amino-substituted thioacrylamides is presented. Enamines are generated in a highly chemoselective amide hydrosilylation reaction catalyzed by molybdenum hexacarbonyl in combination with 1,1,3,3-tetramethyldisiloxane. The direct addition of either isocyanate or isothiocyanate generates the