SiO<sub>2</sub>–H<sub>3</sub>BO<sub>3</sub>promoted solvent-free, green and sustainable synthesis of bioactive 1-substituted-1H-tetrazole analogues
作者:Mehtab Parveen、Faheem Ahmad、Ali Mohammed Malla、Shaista Azaz
DOI:10.1039/c4nj02079k
日期:——
1-substituted-1H-tetrazole analogues 4(a–o) were synthesized, which were typically accessed via a facile, solvent-free and green synthetic protocol. The reaction involves expeditious reusable catalyst (SiO2–H3BO3) promoted condensation between a variety of heterocyclic/aromatic amines, sodium azide and triethyl ortho-formate, eliminating the use of an environmentally toxic solvent. This new eco-friendly and sustainable
Pyrazolidine Derivatives with Heteroaryl Urea as Dipeptidyl Peptidase IV Inhibitors
作者:Jin Hee Ahn、Sun Ho Jung、Jin Ah Kim、Seog Beom Song、Soon Ji Kwon、Kwang Rok Kim、Sang Dal Rhee、Sung-Dae Park、Jae Mok Lee、Sung Soo Kim、Hyae Gyeong Cheon
DOI:10.1248/cpb.53.1048
日期:——
In the continuation of efforts to modify the structure of our novel DP-IV inhibitors, a series of pyrazolidine derivatives with heteroaryl urea was synthesized and evaluated for their ability to inhibit dipeptidyl peptidase IV (DP-IV).
A Z-isomer of 2-(5-amino- 1,2,4-thiadiazol-3-yl)-2-(methoxyimino)acetic acid, which is the common acyl moiety of clinically useful cephalosporins, has been prepared from the aminoisoxazols through the thiadiazol-acetate in two pathways.
Process for preparing 1,2,4-thiadiazole derivatives
申请人:Katayama Seiyakusyo Co. Ltd.
公开号:US05585494A1
公开(公告)日:1996-12-17
An improved process for the production of 5-amino-1,2,4-thiadiazol-3-yl-(2-(lower)-alkoxyimino)acetic acids starting from 5-substituted- or unsubstituted-3-amino-isoxazole compounds is disclosed herein. The title compounds are useful as acylating agents for the production of 7-acylaminocephalosporins.