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.
Enhanced reactivity of NaBH4 was observed as a solution in N-methylpyrrolidone (NMP). Thus, a simple protocol for debromination of alkyl bromide and sulfonate is devised with NMP as a key solvent. Also described is a new mixed borohydride system, NaBH4-LiOTf-NMP, which works as an alternative to NaBH3CN for the S(N)2 type displacement. No reports have ever revealed usefulness of NMP in borohydride reduction. (C) 2001 Elsevier Science Ltd. All rights reserved.