作者:Jerry S Sun、Andrew H Geiser、Benjamin Frydman
DOI:10.1016/s0040-4039(98)01880-2
日期:1998.11
of lithium hydride to the frozen solution of the quinone in dimethyl sulfoxide. As the solution thawed, the lithium quinone was slowly formed and was then alkylated with 3,3-dimethylallyl bromide. Lapachol was thus obtained in 40% yield. When treated with m-chloroperoxybenzoic acid it was converted into its epoxide, that was cyclized with boron trifluoride etherate to 3-hydroxy-β-lapachone in 67% overall
通过将氢化锂加到醌在二甲基亚砜中的冷冻溶液中,原位制备2-羟基-1,4-萘醌的锂盐。当溶液解冻时,锂醌缓慢形成,然后用3,3-二甲基烯丙基溴化物烷基化。因此以40%的产率获得了拉帕胆。用间氯过氧苯甲酸处理后,将其转化为环氧化物,用三氟化硼醚化物将其环化为3-羟基-β-拉帕酮,总收率为67%。后者的酯通过使用1,1'-羰基二咪唑和DBU作为缩合剂与羧酸衍生物缩合而制备。