The object of the present invention is to provide a novel 22-oxavitamin D derivative having a hydroxy group at both 1α- and 3α-positions. According to the present invention, there is provided 22-oxavitamin D derivatives having the following general formula (I):
(wherein R1 represents a straight or branched C4-C10 alkyl group having 1 to 3 hydroxy groups, and R2 and R3 each independently represents a hydrogen atom or a protecting group),
intermediates for the synthesis of the derivatives, and a method for producing them.
本发明的目的是提供一种新型22-
氧化
维生素D衍
生物,其在1α-和3α-位置都具有羟基。根据本发明,提供了具有以下一般式(I)的22-
氧化
维生素D衍
生物(其中,R1代表具有1至3个羟基的直链或支链C4-C10烷基,R2和R3各自独立地代表
氢原子或保护基),用于合成衍
生物的
中间体,以及制备它们的方法。