Synthesis of 4-Alkoxyquinolines from Quinoline Reissert Compounds
摘要:
The quinoline Reissert compound (5a) was converted to 1-benzoyl-3-bromo-2-cyano-1, 2, 3, 4-tetrahydro-4-methoxyquinoline (6a) by successive treatment in methanol with bromine and aq. sodium carbonate. Hydrolysis of 6a with hydrochrolic acid gave 3-bromoquinoline (4; R = H), but that with aq. sodium hydroxide afforded 4-methoxyquinoline (7a). Reissert compounds derived from some quinoline derivatives (5) gave the corresponding 4-methoxyquinolines (7) through tetrahydroquinolines (6) in a similar way.
The CN shuffle: The described intramolecular alkenyl‐ and acylcyanation reaction of activated alkenes proceed by cleavage of a CN bond. This protocol provides access to functionalized acyclic nitriles with quaternary carbon centers under neutral and mild reaction conditions, demonstrates broad scope, and good functional‐group compatibility and versatility. Y=O or CHR4; R1,R4=electron‐withdrawing group;
A series of 1-[acylthio) and (mercapto)-1-oxoalkyl]-1,2,3,4-tetrahydroquinoline-2-carboxylic acids and salts thereof are useful as Angiotensin I converting enzyme inhibitors.