61733-82-2Relevant articles and documents
Stabilization of Azapeptides by Namide···H-NamideHydrogen Bonds
Baruah, Kalpita,Sahariah, Biswajit,Sakpal, Sushil S.,Deka, Jugal Kishore Rai,Bar, Arun Kumar,Bagchi, Sayan,Sarma, Bani Kanta
supporting information, p. 4949 - 4954 (2021/06/28)
An unusual Namide···H-Namide hydrogen bond (HB) was previously proposed to stabilize the azapeptide β-Turns. Herein we provide experimental evidence for the Namide···H-Namide HB and show that this HB endows a stabilization of 1-3 kcal·mol-1 and enforces the trans-cis-Trans (t-c-T) and cis-cis-Trans (c-c-T) amide bond conformations in azapeptides and N-methyl-Azapeptides, respectively. Our results indicate that these Namide···H-Namide HBs can have stabilizing contributions even in short azapeptides that cannot fold to form β-Turns.
Superior reactivity of thiosemicarbazides in the synthesis of 2-amino-1,3,4-oxadiazoles
Dolman, Sarah J.,Gosselin, Francis,O'Shea, Paul D.,Davies, Ian W.
, p. 9548 - 9551 (2007/10/03)
(Chemical Equation Presented) A facile and general protocol for the preparation of 2-amino-1,3,4-oxadiazoles is reported. This method relies on a tosyl chloride/pyridine-mediated cyclization of a thiosemicarbazide, which is readily prepared by acylation o
An efficient synthesis of 1,3,4-oxadiazoles from N,N′-diacylhydrazines using Ph3P·Br2, Ph3P·CCl4 or Ph3P·CBr4 adducts as condensing agents
Mazurkiewicz,Grymel
, p. 77 - 82 (2007/10/03)
1,3,4-Oxadiazoles including 2-amino derivatives were effectively synthesized by treatment of N,N′-diacylhydrazines or N-acylsemicarbazides with Ph3P·Br2, Ph3P·CCl4 or Ph3P·CBr4 adducts in the presence of Et3N in CH2Cl2 under mild conditions.