Synthetic anthracyclines: Regiospecific total synthesis of D-ring thiophene analogues of daunomycin.
作者:Yasuyuki KITA、Masayuki KIRIHARA、Jun-ichi SEKIHACHI、Ryuichi OKUNAKA、Manabu SASHO、Shin-ichiro MOHRI、Takao HONDA、Shuji AKAI、Yasumitsu TAMURA、Kin-o SHIMOOKA
DOI:10.1248/cpb.38.1836
日期:——
base-induced cycloaddition reaction of 8 with the chloroquinone acetal (29). These cycloadducts (12 and 30) were converted to D-ring thiophene analogues (28 and 38) of daunomycin (1a). Another D-ring thiophene analogue (42) which has a trimethylsilyl substituent in the D-ring was also prepared.
由(2-羧基噻吩-3-基)乙酸(5)制得的关键酸酐2-乙酰氧基-[2-羧基-5-(三甲基甲硅烷基)噻吩-3-基]乙酸酐(8)碱诱导的与氯醌缩醛的环加成反应(11),得到7,7-乙二氧基-2-三甲基甲硅烷基-6,7,8,9-四氢蒽[2,3-b]噻吩-5,10-二酮(12 )区域选择性。类似地,通过强碱诱导的环加成反应获得了区域异构的8,8-乙二氧基-2-三甲基甲硅烷基-6,7,8,9-四氢蒽[2,3-b]噻吩-5,10-二酮(30)。 8与氯醌缩醛(29)。这些环加合物(12和30)被转化为道诺霉素(1a)的D环噻吩类似物(28和38)。还制备了在D-环中具有三甲基甲硅烷基取代基的另一D-环噻吩类似物(42)。