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    • 6. 发明专利
    • Process for producing quinazolin-4-one derivatives
    • AU6755496A
    • 1997-03-19
    • AU6755496
    • 1996-08-26
    • OTSUKA PHARMA FACTORY INC
    • MIYATA KAZUYOSHIKUROGI YASUHISASAKAI YASUHIROTSUDA YOSHIHIKO
    • C07D239/90C07D239/91C07F9/6512
    • PCT No. PCT/JP96/02388 Sec. 371 Date Feb. 25, 1998 Sec. 102(e) Date Feb. 25, 1998 PCT Filed Aug. 26, 1996 PCT Pub. No. WO97/08153 PCT Pub. Date Mar. 6, 1997The present invention provides a novel process for preparing a series of quinazolin-4-one derivatives in high yields with reduced amounts of byproducts, the process comprising reacting, in the presence of a base, a trialkylsilyl halide with a compound represented by the formula wherein; R5 is a phenyl group which may have 1 to 3 substituents each selected from a lower alkyl group, a lower alkoxy group or a halogen atom, a lower alkyl group, a phenyl-lower alkyl group which may have a halogen atom as a substituent on the phenyl ring, a lower alkenyl group, a lower alkoxy-lower alkyl group or a lower alkynyl group; R6 is a lower alkyl group, a halogen-substituted lower alkyl group, a lower alkoxycarbonyl group or a phenyl group which may have, as a substituent, a lower alkyl group or a group of the formula wherein A is an oxygen atom or a single bond, Z is a lower alkylene group, R7 is a lower alkyl group and R8 is a lower alkoxy group, a phenyl group or a phenyl-lower alkoxy group which may have a halogen atom on the phenyl ring; to produce the quinazolin-4-one derivatives which is valuable as pharmaceuticals or intermediates for synthesis thereof and represented by the formula wherein R1,R2, R3, R4, R5, and R6 are as defined above.