Abstract:
4,5-Substituted-2-formylaminobenzamides of the general formula (1) can be produced by reacting a compound of the general formula (6) with formic acid in an organic solvent, and can be further converted into 6,7-substituted-quinazolin-4-ones of the general formula (7) through cyclization in the presence of a base: (1) (6) (7) wherein R1 and R2 are each hydrogen, alkyl which may have a substituent, cycloalkyl, alkenyl, aralkyl, aryl, or acyl, and the substituent is alkyl, cycloalkyl, alkenyl, aryl, acyl, alkoxycarbonyl, halogeno, or the like.
Abstract:
A method for preparing 6,7-dihyfroxycoumarin-3- carboxy compound having formula (3), wherein R is H or an alkyl group, being useful as an intermediate of a medicine or the like, which comprises reacting 6,7-methylenedioxycoumarin-3-carboxy compound having formula (1) with molecular chlorine in the presence of a chlorine-containing compound (such as PCl3 and PCl5) to form 6,7-chloromethylenedioxycoumarin-3-carboxy compound having formula (2), and subjecting the 6,7-chloromethylenedioxycoumarin-3-carboxy compound to a hydrolysis reaction or alcoholysis reaction.
Abstract:
Compounds represented by the general formula (I) can be produced by reacting a benzene compound represented by the general formula (IV) or (V) with an alkenylidene diacetate represented by the general formula (VI) in the presence of a catalyst comprising (a) a boron halide, (b) a triflate of a group 11 element, (c) a halide of a group 12 element, and (d) at least one member selected from among triflates and halides of tin and elements of atomic numbers of 58 and 66 to 71: (I) (IV) (V) (VI) wherein R and R are each H or C1-10 alkyl; A is a substituted phenyl group corresponding to a compound of the general formula (IV) or (V); R and R are each C1-4 alkyl; m is 0 or 1 to 4; n is 1 to 5; and k is 1 or 2.