Cyclization of 1-(2-Alkynylphenyl)-3,3-dialkyltriazenes: A Convenient, High-Yield Synthesis of Substituted Cinnolines and Isoindazoles
摘要:
A new route to isoindazoles and cinnolines through the cyclization of (2-alkynylphenyl)triazenes under neutral conditions is presented. The products that result from heating the starting triazenes depend on both the type of alkyne ortho to the triazene functionality and the temperature used. Butadiyne moieties ortho to dialkyltriazenes yield bis-isoindazole dimers when heated to 150 degreesC in MeI. A requirement for cyclization in MeI is that the (2-alkynylphenyl)triazene must contain a suitably electron-withdrawing substituent on the phenyl ring to deactivate the triazene toward methylation-induced decomposition to an iodoarene. Ethynyl moieties ortho to dialkyltriazenes yield both isoindazole dimers as well as 3-formylisoindazoles when subjected to the same conditions. Replacing MeI with 1,2-dichlorobenzene as solvent allows for the general cyclization of (2-ethynylphenyl)dialkyltriazenes. Heating to 170 degreesC results in a mixture of isoindazole and cinnoline products, whereas the cinnolines are produced exclusively in high yield at 200 degreesC. Alternatively, the isoindazoles can be obtained in good to excellent yield by stirring a 1,2-dichloroethane solution of the starting triazene with CuCl overnight at 50 degreesC.
INHIBITORS OF THE RENAL OUTER MEDULLARY POTASSIUM CHANNEL
申请人:Merck Sharp & Dohme Corp.
公开号:EP2632464A1
公开(公告)日:2013-09-04
[EN] INHIBITORS OF THE RENAL OUTER MEDULLARY POTASSIUM CHANNEL<br/>[FR] INHIBITEURS DU CANAL À POTASSIUM DE LA MEDULLA EXTERNE DU REIN
申请人:MERCK SHARP & DOHME
公开号:WO2012058134A1
公开(公告)日:2012-05-03
This invention relates to compounds having structural Formula (I); and pharmaceutically acceptable salts thereof which are inhibitors of the Renal Outer Medullary Potassium (ROMK) channel (Kir 1.1). The compounds of Formula I are useful as diuretics and natriuretics and therefore are useful for the therapy and prophylaxis of disorders resulting from excessive salt and water retention, including cardiovascular diseases such as hypertension and chronic and acute heart failure.