DL-1,2-Dideoxy-1,2-difluoro-myo-inositol was prepared from DL-3,4,5,6-tetra-O-benzyl-myo-inositol in five steps in an overall yield of 36%. The fluoro substituents were introduced with DAST in separate steps by displacement of hydroxy substituents with inversion of stereochemistry. Difluorination could not be achieved in one step because of competing formation of a 1,4-anhydro derivative. DL-1,2-Dideoxy-1,2-difluoro-scyllo-inositol was prepared in 42% overall yield using similar chemistry, with the required inversion of one stereocentre being accomplished by displacement of a tosyl group with caesium propionate. Both difluoroinositol analogues increased the levels of phytic acid (InsP6) in a skeletal muscle cell line. Each compound was tetraphosphorylated with dibenzyl N,N-diisopropylphosphoramidite in the presence of 1H-tetrazole, with subsequent oxidation of the phosphite with MCPBA. The P–OBn groups were removed by H2/Pd–C, and the sodium salts of the tetrakisphosphates of the difluoroinositol analogues were obtained by cation exchange.
以 DL-3,4,5,6-四-O-苄基肌醇为原料,分五个步骤制备了 DL-1,2-二脱氧-1,2-二
氟肌醇,总收率为 36%。
氟取代基是用
DAST 通过取代羟基和反转立体
化学分步引入的。由于 1,4-脱氢衍
生物的竞争生成,二
氟化反应无法在一个步骤中完成。使用类似的
化学方法制备了 DL-1,2-二脱氧-1,2-二
氟-酰基肌醇,总产率为 42%,所需的一个立体中心的反转是通过用
丙酸铯置换一个
甲苯基来实现的。这两种二
氟肌
醇类似物都能增加骨骼肌
细胞系中植酸(InsP6)的含量。每种化合物都是在 1H
四氮唑存在下用 N,N-二异丙基亚
磷酰胺二苄基进行
四磷酸化,然后用 MCPBA 氧化
亚磷酸酯。用 H2/Pd-C 除去 P-OBn 基团,然后通过阳离子交换获得二
氟肌
醇类似物的
四磷酸盐钠盐。