1050447-10-3

Upstream product

• 309956-78-3 (R)-piperidin-3-ylcarbamic acid tert-butyl ester 
• 65-85-0 benzoic acid 
• 1050446-95-1 (R)-1-benzoylnipecotamide 

Downstream Products

• 1050447-13-6 (R)-1-benzoyl-3-(p-chloro benzoylamino)piperidine 
• 1050447-11-4 (R)-1-benzoyl-3-(benzoylamino) piperidine 
• 1050447-12-5 (R)-1-benzoyl-3-(p-methylbenzoylamino)piperidine 

Relevant academic research and scientific papers

Enantioselective synthesis and physicochemical properties of libraries of 3-amino- and 3-amidofluoropiperidines

The enantioselective syntheses of 3-amino-5-fluoropiperidines and 3-amino-5,5-difluoropiperidines were developed using the ring enlargement of prolinols to access libraries of 3-amino- and 3-amidofluoropiperidines. The study of the physicochemical properties revealed that fluorine atom(s) decrease(s) the pKa and modulate(s) the lipophilicity of 3-aminopiperidines. The relative stereochemistry of the fluorine atoms with the amino groups at C3 on the piperidine core has a small effect on the pK a due to conformationnal modifications induced by fluorine atom(s). In the protonated forms, the C-F bond is in an axial position due to a dipole-dipole interaction between the N-H+ and C-F bonds. Predictions of the physicochemical properties using common software appeared to be limited to determine correct values of pKa and/or differences of pK a between cis- and trans-3-amino-5-fluoropiperidines.

METHOD FOR PRODUCING OPTICALLY ACTIVE 3-AMINOPIPERIDINE OR SALT THEREOF

The present invention relates to a method for producing an optically active 3-aminopiperidine or salt thereof. In the method, a racemic nipecotamide is stereoselectively hydrolyzed to obtain an optically active nipecotamide and an optically active nipecotic acid in the presence of an enzyme source derived from an organism, and then the optically active nipecotamide is derived into an optically active aminopiperidine or salt thereof by aroylation, Hofmann rearrangement, deprotection of the amino group and further deprotection; or the optically active nipecotamide is derived into an optically active aminopiperidine or salt thereof by selective protection with BOC, Hofmann rearrangement and further deprotection. It is possible by the present invention to produce an optically active 3-aminopiperidine or salt thereof useful as a pharmaceutical intermediate from an inexpensive and easily available starting material by easy method applicable to industrial manufacturing.