A process for preparation of a compound of formula I:
wherein:
R1 represents CH3 or H; and P represents a protecting group;
comprising reacting a compound of formula IV:
wherein R1 and P and are defined above and R4 represents triflate or SO2F;
in the presence of a catalyst and (R3)3SnCH2OP″, wherein each R3 represents C1-4 lower alkyl, and P″ represents H or a protecting group, to yield the compound of formula I.
一种制备公式I化合物的方法,其中:R1代表
CH3或H; P代表保护基; 包括在催化剂和(R3)3SnCH2OP"的存在下,将公式IV化合物与R4代表三
氟甲烷磺酸酯或SO2F的化合物反应,其中R1和P如上所定义,R4代表三
氟甲烷磺酸酯或SO2F,以生成公式I化合物。其中,每个R3代表C1-4低烷基,P"代表H或保护基。