Compounds of the general formula
wherein R represents a hydrogen atom or a hydroxyl protecting group, Y represents a hydrogen atom or an optionally protected hydroxyl group, X represents the residue of a dienophile and either R1 represents a halogen atom a hydrocarbylsulphonyloxy group or a group of the formula -Z-R3 (in which Z represents -O-, -S-, -SO-, -NR4- or -CR4R5- and R3, R4 and R5, which may be the same or different, each represent a hydrogen atom or a straight or branched aliphatic group having 1-12 carbon atoms and which may optionally carry one or more substituents) and R2 represents a hydrogen atom or R1 and R2 together represent an oxo group or an optionally substituted alkylidene group, except that R1 and R2 together with the group -CH(CH3)CH- to which they are attached do not represent a group having the branched 17p-hydrocarbyl side chain skeleton of vitamin D2 or vitamin D3 of use in the preparation of novel vitamin D analogues.
通式如下的化合物
其中 R 代表氢原子或羟基保护基,Y 代表氢原子或可选的羟基保护基,X 代表亲二烯基的残基,R1 代表卤素原子、烃基磺酰氧基或式 -Z-R3 的基团(其中 Z 代表 -O-、-S-、-SO-、-NR4- 或 -CR4R5-,R3、R4 和 R5 可以相同或不同、各自代表氢原子或具有 1-12 个碳原子的直链或支链脂肪族基团,可任选带有一个或多个取代基),R2 代表氢原子或 R1 和 R2 共同代表氧代基团或任选取代的亚烷基基团,但 R1 和 R2 连同其所连接的基团-CH(
CH3)CH- 不代表具有用于制备新型
维生素 D 类似物的
维生素 D2 或
维生素 D3 的支链 17p- 氢羰基侧链骨架的基团。