A New One-Step Synthesis of 1,2,4-Triazino[2,3-c]quinazolines
作者:Oleksandr V. Karpenko、Sergiy I. Kovalenko、Oleksiy O. Chekotylo、Svitlana V. Shishkina
DOI:10.3987/com-06-10971
日期:——
A new and efficient one-step protocol for the synthesis of 3-substituted 2H-l,2,4-triazino[2,3-c]quinazolin-2-ones (5) was developed starting from 4-hydrazinoquinazoline (1) and α-ketocarboxylic acids and their esters. Corresponding hydrazones (2a,c and 3a,c,e) were isolated as intermediate products. Further cyclocondensation followed by acid-catalyzed Dimroth rearrangement resulted in the title derivatives
Thiophen als Strukturelement physiologisch aktiver Substanzen, 17. Mitt. Thienoisoxazole durch nukleophile Substitution
作者:Dieter Binder、Christian R. Noe、Karl Baumann、Wolfgang Holzer
DOI:10.1002/ardp.19883210704
日期:——
Eine neue Synthese von 3‐substituierten Thieno[2,3‐d]‐ bzw. [3,2‐d]isoxazolen mittels Ringschluß durch intramolekulare nukleophile Substitution an Oximen des Typs 5 bzw. 7 wird beschrieben. Seitenkettenmodifikation an 2d führt zum Sulfonamid 1b, welches ein Thiophenanalogon des Antikonvulsivums AD 810 (A) ist. 1b zeigt sowohl im Antipentetrazol‐Test als auch im Elektroschock‐Test praktisch keine Aktivität
Thiophenyl triazol-3-one derivatives as smooth muscle relaxants
申请人:——
公开号:US20030144333A1
公开(公告)日:2003-07-31
The present invention provides novel [1,2,4]triazole-3-one derivatives having the general formula (I)
1
wherein:
Q is
2
and R
1
, R
2
, R
3
, R
4
, R
5
and R
6
are as defined herein or a nontoxic pharmaceutically acceptable salt or solvate thereof which are smooth muscle relaxants and useful in treating disorders responsive to relaxation of smooth muscle such as asthma, irritable bowel syndrome, male erectile dysfunction and urinary incontinence.