申请人:Nisshin Flour Milling Co., Ltd.
公开号:EP1043321A1
公开(公告)日:2000-10-11
A process for the preparation of a tetrahydropyran derivative of formula (II)
wherein Z1, Z2, Z3, Z4 and Z5 have respectively the same meaning as defined below for R1, R2, R3, R4 and R5, provided that a C1-C4 alkylcarbonyloxy group in formula (I) is converted into a hydroxyl group, and a C1-C4 alkylcarbonyloxy C1-C4 alkyl group is converted into a hydroxyl C1-C4 alkyl group, which comprises solvolyzing in an organic solvent a compound of formula (I)
wherein R1, R2, R3 and R4 may be the same or different, and each represents a hydrogen atom, a hydroxyl group, a C1-C4 alkoxy group, a C1-C4 alkylcarbonyloxy group or an aryl C1-C4 alkyloxy group, and R5 represents a hydrogen atom, a C1-C4 alkyl group, a hydroxy C1-C4 alkyl group or a C1-C4 alkylcarbonyloxy C1-C4 alkyl group, provided that at least one of R1, R2, R3 and R4 is a C1-C4 alkylcarbonyloxy group, in the presence of a base, followed by neutralizing with an acid and crystallizing. The process does not require special purification means such as an ion exchange.
一种式(II)的四氢吡喃衍生物的制备方法
其中 Z1、Z2、Z3、Z4 和 Z5 分别具有与下文中 R1、R2、R3、R4 和 R5 所定义的相同含义,条件是式 (I) 中的 C1-C4 烷基甲酰氧基转化为羟基,C1-C4 烷基甲酰氧基转化为羟基 C1-C4 烷基,该工艺包括在有机溶剂中溶解式 (I) 的化合物
其中 R1、R2、R3 和 R4 可以相同或不同,各自代表氢原子、羟基、C1-C4 烷氧基、C1-C4 烷基羰氧基或芳基 C1-C4 烷氧基,R5 代表氢原子、C1-C4 烷基、羟基 C1-C4 烷基或 C1-C4 烷基羰氧基 C1-C4烷基,条件是 R1、R2、R3 和 R4 中至少有一个是 C1-C4 烷基羰氧基,在碱存在下溶解,然后用酸中和并结晶。该工艺不需要特殊的纯化手段,如离子交换。