申请人:Takeda Chemical Industries, Ltd.
公开号:EP0136693A2
公开(公告)日:1985-04-10
A cytidine derivative of the formula:
wherein R1 is a carboxylic acid-derived acyl having not less than 3 carbon atoms, and R2, R3 and R4 each represents a carboxylic acid-derived acyl, is effectively produced by subjecting a compound of the formula:
wherein R1 is as defined as above and a compound of the formula:
wherein A is a group of the formula -OR5 where R5 is a carboxylic acid-derived acyl, or a halogen, and each of R2, R3 and R' is as defined as above, to condensation in the presence of a Lewis acid.
式中的胞苷衍生物
其中 R1 是具有不少于 3 个碳原子的羧酸衍生酰基,R2、R3 和 R4 各代表一个羧酸衍生酰基:
其中 R1 如上所定义,而式:
其中 A 是式 -OR5 的基团,其中 R5 是羧酸衍生酰基或卤素,且 R2、R3 和 R' 各代表如上定义,在路易斯酸存在下进行缩合。