Synthetic study on the unique dimeric arylpiperazine: access to the minor contaminant of aripiprazole
摘要:
The dimeric derivative of Aripiprazole was synthesized via the two notable synthetic technologies as a key step: (1) efficient aldehyde bis-arylation by Bi(OTf)(3) and (2) facile Wynberg amination at room temperature. The synthesis has established the structural identity with the minor contaminant sometimes present in Aripiprazole. (C) 2002 Elsevier Science Ltd. All rights reserved.
Development of an efficient catalytic reaction promoted by a metal triflate has been emphasized in contemporary synthesis. To evaluate the potential of some metal trflates such as bismuth triflate in our process research, we devised here an expedient protocol for its preparation and characterization. Comparison of its catalytic activity with other well-known metal triflates such as scandium triflate and copper triflate was made in a glyoxylate arylation reaction, which is a useful transformation for the construction of a 1,1-diarylethane skeleton, Furthermore, NMR analysis of Bi(OTf)(3) in acetone-d(6) revealed the unique nature and reactivity of the triflate, which has not heretofore been disclosed.