Synthesis of 3′-(<i>N</i>-Acetylpiperazino)-2′,3′-dideoxy-D-<i>ribo</i>-hexofuranosyl and -D-<i>erythro</i>-pentofuranosyl Thymine Nucleosides
作者:Gorm Vang Petersen、Jesper Platz、Claus Nielsen、Jesper Wengel
DOI:10.1055/s-1994-25582
日期:——
Michael-type addition of N-acetylpiperazine to the α,β-unsaturated hexose aldehyde 1 in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene gave an anomeric mixture of 3-(N-acetylpiperazino)-2,3-di-deoxy-D-ribo-hexofuranoses, which was acetylated to give the tri-O-acetyl derivative 2. Reaction of 2 with silylated thymine 5 using trimethylsilyl trifluoromethanesulfonate as catalyst gave the hexofuranose nucleosides 6 and 7. The pure anomers were deprotected using a saturated solution of NH3 in dry MeOH affording 8 and 9. Conversion of 8 and 9 into the corresponding pentofuranose nucleosides 10 and 11 was accomplished by periodate oxidative cleavage and subsequent reduction.
在 1,8-二氮杂双环[5.4.0]十一-7-烯存在下,将 N-乙酰基哌嗪与δ,δ²-不饱和六糖醛 1 进行迈克尔式加成,可得到 3-(N-乙酰基哌嗪基)-2,3-二脱氧-D-三呋喃糖的异构体混合物,将其乙酰化可得到三-O-乙酰基衍生物 2。 以三氟甲磺酸三甲基硅酯为催化剂,将 2 与硅烷基化的胸腺嘧啶 5 反应,得到六呋喃糖核苷 6 和 7。使用 NH3 在干 MeOH 中的饱和溶液对纯异构体进行脱保护,得到 8 和 9。通过高碘酸盐氧化裂解和随后的还原反应,将 8 和 9 转化为相应的五呋喃糖核苷 10 和 11。