Alkyl 2-chloroethoxymethyl(diethoxymethyl)phosphinates VII and XIII were prepared by reaction of silyl esters of dialkoxymethylphosphinic acid with 2-chloroethyl chloromethyl ether. Adenine was alkylated with VII and XIII to give [2-(adenin-9-yl)ethoxy]methyl(diethoxymethyl)phosphinates VIII and XIV, bearing the dialkoxymethyl protecting group on the phosphorus atom. Acid hydrolysis of compounds VIII and XIV afforded 9-(2-phosphinoethoxymethyl)adenine (X). Alkyl dialkoxymethylphosphinates V and XI reacted with paraformaldehyde to give hydroxymethylphosphinates XV and XIX which were converted into the synthons XVI, XVII and XVIII capable of introducing a protected hydroxymethylphosphino group on a hydroxy or amino group.
通过将二烷氧甲基(二乙氧甲基)
膦酸硅酯与2-
氯乙基
氯甲醚反应制备了烷基2-
氯乙氧甲基(二乙氧甲基)
膦酸酯VII和XIII。
腺嘌呤与VII和XIII烷基化,得到[2-(
腺嘌呤-9-基)乙氧基]甲基(二乙氧甲基)
膦酸酯VIII和XIV,
磷原子上带有二烷氧甲基保护基。对VIII和XIV化合物的酸
水解得到9-(2-膦乙氧甲基)
腺嘌呤X。烷基二乙氧
甲基膦酸酯V和XI与多
聚甲醛反应,得到
羟甲基膦酸酯XV和XIX,进而转化为合成子XVI、XVII和XVIII,能够在羟基或
氨基上引入受保护的羟
甲基膦基基团。