A reagent based DOS strategy via Evans chiral auxiliary: highly stereoselective Michael reaction towards optically active quinolizidinones, piperidinones and pyrrolidinones
作者:Subhabrata Sen、Siva R. Kamma、Rambabu Gundla、Uma Adepally、Santosh Kuncha、Sridhar Thirnathi、U. Viplava Prasad
DOI:10.1039/c2ra22115b
日期:——
In the present study, we have demonstrated the diversity oriented synthesis of nitrogen heterocycles viz. chiral piperidinones, quinolizidinones and diaryl pyrrolidinones from Michael adducts generated via a TiCl4-catalyzed highly stereoselective Michael reaction with nitrostyrenes and an Evans chiral auxiliary. We also reported a Cu-4,4’-(isopropyl)-substituted isopropylidene-bridged 2,2’-bis-1,3’-oxazoline catalyst mediated catalytic asymmetric version of this reaction. In silico analysis is utilized to evaluate the diversity of the set of compounds against shape space (PMI), polar surface area (PSA) calculations and relevant drug like properties (viz. HBA, HBD, PSA, mol. wt., log P and log D). Finally, the molecules were screened against microorganisms to assess their antimicrobial properties.
Kinetics and mechanism of the oxidation of substituted benzylamines by hexamethylenetetramine-bromine
作者:Rashmi Dubey、Seema Kothari、Kalyan K. Banerji
DOI:10.1002/poc.456
日期:2002.2
The oxidation of substituted benzylamines by hexamethylenetetramine-bromine (HABR) to the corresponding aldimines is first order with respect to each the amine and HABR. It is proposed that HABR itself is the reactive oxidizing species. The oxidation of deuterated benzylamine (PhCD2NH2) indicated a substantial kinetic isotope effect (kH/kD = 5.60 at 293 K). This confirmed the cleavage of an α-C—H bond
A Highly Efficient and Useful Synthetic Protocol for the Synthesis of Bis[aryl(diethoxyphosphoryl)methyl]amines from Aromatic Aldehydes Using Acetyl Chloride as an Efficient Catalyst
作者:Babak Kaboudin、Ehsan Jafari
DOI:10.1055/s-2007-983720
日期:2007.6
bis[aryl(diethoxyphosphoryl)methyl]amines has been developed. The treatment of aromatic aldehydes with ammonia followed by reaction with diethyl phosphite in the presence of acetyl chloride as catalyst gives bis[aryl(diethoxyphosphoryl)methyl]amines. This method is easy, rapid, and a high yielding method for the synthesis of bis[aryl(diethoxyphosphoryl)methyl]amines with good diastereo-selection from