allows facile macrocyclization of peptides in the N‐to‐C direction. Combined with the previously developed β‐C(sp3)−H arylation method for peptide macrocyclization in the C‐to‐N direction, a pair of palladium‐catalyzed reactions were obtained that are directionally orthogonal, and the first example of one‐pot synthesis of bicyclic peptides via Pd‐catalyzed β‐C(sp3)−H and δ‐C(sp2)−H activation is demonstrated
A CONVENIENT METHOD FOR THE SYNTHESIS OF CARBOXAMIDES AND PEPTIDES BY THE USE OF TETRABUTYLAMMONIUM SALTS
作者:Yutaka Watanabe、Teruaki Mukaiyama
DOI:10.1246/cl.1981.285
日期:1981.3.5
aqueous THF with bis(o-nitrophenyl) phenylphosphonate in the presence of tetrabutylammonium hydrogen sulfate or bromide. Carboxylic esters are also successfully converted to amides via carboxylate salts in one-pot.
The reaction of carboxylic acids with acetals of N,N-dimethylformamide represents a preparatively useful esterification method. Experiments bearing on the use, properties and scope of this reaction are described.
[D-His2] Leu-enkephalin and [D-His2] adrenorphin were synthesized. In addition, eight [D-Arg2] enkephalin-related peptides were synthesized. Their inhibitory effects on electrically stimulated myenteric plexus-longitudinal muscle preparations of guinea-pig ileum were examined.
Methionine.sup.5 -enkephalin sulfoxides and sulfones
申请人:G. D. Searle & Co.
公开号:US04144228A1
公开(公告)日:1979-03-13
Methionine.sup.5 -enkephalin sulfoxides and sulfones having agonist activity at opiate receptors are disclosed herein. These sulfoxides and sulfones are useful as analgesics, non-addicting narcotic antagonists and anti-diarrheal agents.