Raymond Dagnino

1-Alkyl-3-amino-5-aryl-1H-[1,2,4]triazoles: Novel synthesis via cyclization of N-acyl-S-methylisothioureas with alkylhydrazines and their potent corticotropin-releasing factor-1 (CRF1) receptor antagonist activities

Cyclizations of alkylhydrazines with N-acyl-S-methylisothioureas, readily synthesized from acyl chlorides, sodium thioisocyanate, dialkylamines then methyl iodide in a one-pot reaction, gave 1-alkyl-3-dialkylamino-5-phenyltriazoles 7 as major products. The regioisomers were assigned through the use of NOE NMR experiments. While bearing a N-bis(cyclopropyl)methyl-N-propylamino group, this series of compounds shows very good binding affinity on the human CRF(1) receptor. Among them, 1-methyl-3-[N-bis(cyclopropyl)methyl-N-propylamino]-5-(2,4-dichlorophenyl)-1H-[1,2,4]triazole 7a had the best binding affinity for the CRF(1) receptor (K(i)=9 nM).

Improved synthesis of arginine peptide aldehydes

Abstract An improved method for the synthesis of peptide argininals by the use of a new aldehyde protecting group (diphenylmethyl semicarbazide) is reported.

Facile determination of the Optical Purity of α-N-Boc-Amino Aldehydes

Abstract A facile 1 H NMR spectroscopic method is presented for the determination of the optical purity of α-amino aldehydes, via derivatization with optically pure semicarbazides.