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Pilot-plant preparation of an αvβ3 integrin antagonist. Part 3. Process research and development of a diisopropylcarbodiimide and catalytic 1-hydroxybenzotriazole peptide coupling

  • Jerry D. Clark
  • , D. Keith Anderson
  • , David V. Banaszak
  • , Derek B. Brown
  • , Ann M. Czyzewski
  • , Albert D. Edeny
  • , Puneh S. Forouzi
  • , Donald J. Gallagher
  • , V. H. Iskos
  • , H. Peter Kleine
  • , Carl M. Knable
  • , Melissa K. Lantz
  • , Mark A. Lapack
  • , Christine M.V. Moore
  • , Frank W. Muellner
  • , James B. Murphy
  • , Carlos A. Orihuela
  • , Mark A. Pietz
  • , Thomas E. Rogers
  • , Peter G. Ruminski
  • Harish K. Santhanam, Tobin C. Schilke, Ajit S. Shah, Ahmad Y. Sheikh, Gerald A. Weisenburger, Bruce E. Wise

Research output: Contribution to journalArticlepeer-review

Abstract

Studies directed toward the process research, development, and scale-up preparation of the potential αvβ3 integrin antagonist 1 are described. A convergent approach is detailed wherein tetrahydropyrimidine hydroxybenzoic acid 2 is linked to the β-amino acid ester 3 via a diisoproylcarbodiimide, catalytic HOBt coupling reaction. Saponification of the resulting ethyl ester, isolation of the corresponding zwitterion, H3PO4 salt formation, crystallization, and acetonitrile-to-acetone exchange give rise to 1 as a crystalline monohydrate in 67% overall yield from 4.

Original languageEnglish
Pages (from-to)1088-1093
Number of pages6
JournalOrganic Process Research and Development
Volume13
Issue number6
DOIs
StatePublished - Nov 20 2009

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