申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0775697A1
公开(公告)日:1997-05-28
A process for producing a 1-substituted tetrahydroquinazoline represented by the formula (III):
wherein Z represents a methylene group which is optionally substituted by an alkyl group; R6 represents an alkyl group or an aralkyl group; R1 and R2 independently represent a hydrogen atom, a halogen atom, a nitro group, an azido group, an alkyl group, an alkenyl group, an aralkyl group, an alkoxy qroupm, an alkoxycarbonyl group, an acyloxy group, or an amino group represented by XNR4R5in which X represents a direct bond, an alkylene group or a carbonyl group, and N, R4 and R5 may form together a five- or six-membered heterocyclic ring or R4 and R5 independently represent an alkyl group or an acyloxy alkyl group; and R3 represents a hydrogen atom, a halogen atom, a nitro group, an azido group, an alkyl group, an alkenyl group, an aralkyl qroup, an alkoxy group, or an alkoxycarbonyl group which comprises reacting tetrahydroquinazolines represented by the formula (I):
wherein R1, R2 and R3 are as defined above with hexamethyldisilazane; and reacting the resultant product with a chloroalkanoate represented by the formula (II):
C1-Z-CO-O-R6 (II)
wherein Z and R6 are as defined above in the presence of an iodide of an alkaline metal, followed by desilylation.
一种生产由式(III)代表的1-取代的四氢喹唑啉的工艺:
其中 Z 代表任选被烷基取代的亚甲基;R6 代表烷基或芳烷基;R1和R2各自代表氢原子、卤素原子、硝基、叠氮基、烷基、烯基、芳烷基、烷氧基、烷氧羰基、酰氧基或由XNR4R5代表的氨基,其中X代表直接键、亚烷基或羰基,N、R4和R5可共同形成五元或六元杂环,或R4和R5各自代表烷基或酰氧基烷基;R3代表氢原子、卤素原子、硝基、叠氮基、烷基、烯基、芳烷基、烷氧基或烷氧基羰基,包括反应式(I)代表的四氢喹唑啉:
其中 R1、R2 和 R3 如上文所定义,与六甲基二硅氮烷反应;并将生成物与式 (II) 所代表的氯代烷酸酯反应:
C1-Z-CO-O-R6 (II)
其中 Z 和 R6 如上文所定义,在碱金属碘化物存在下反应,然后脱硅。