540501-62-0Relevant articles and documents
Design and synthesis of long-acting inhibitors of dipeptidyl peptidase IV
Kondo, Takashi,Sugimoto, Isamu,Nekado, Takahiro,Ochi, Kenya,Ohtani, Tazumi,Tajima, Yohei,Yamamoto, Susumu,Kawabata, Kazuhito,Nakai, Hisao,Toda, Masaaki
, p. 2715 - 2735 (2008/02/08)
A series of (4-substituted prolyl)prolinenitriles were synthesized and evaluated as inhibitors of dipeptidylpeptidase IV (DPP-IV). Among those tested, the 4β-[4-(hydroxyphenyl)prolyl]prolinenitriles showed a potent inhibitory activity with a long duration
Asymmetric hydrogenations for the synthesis of boc-protected 4-alkylprolinols and prolines
Del Valle, Juan R.,Goodman, Murray
, p. 3923 - 3931 (2007/10/03)
The utility of 4-substituted prolinols and their corresponding prolines in peptides, peptidomimetics, and natural products has motivated researchers to find new and efficient routes for their preparation. Herein, we report a general approach to the synthesis of Boc-protected 4-alkylprolinols and prolines via a divergent asymmetric hydrogenation strategy. Intermediate exocyclic olefins were prepared by Wittig-type reactions with ketone 6 and subjected to hydroxyl and sterically directed reductions. The Crabtree catalyst (Ir[COD] PyPCy3PF6) proved to be highly effective in diastereoselective hydrogenations to give trans- substituted pyrrolidines (9). Good facial selectivities were also observed in heterogeneous hydrogenations with Raney-nickel to obtain cis-substituted pyrrolidines (11). Employing this strategy, we describe the synthesis of novel prolinol and proline-based building blocks for incorporation into biologically relevant peptidomimetics.