The preparation of oxygenated naphthyl stannanes bearing an
ortho-methoxy substituent is described, including
stannanes (23) and (25) which are key intermediates for the synthesis of
dimeric pyranonaphthoquinone antibiotics. Stannanes (17), (19) and
(21)–(23) were obtained by metal–halogen exchange of the
corresponding bromonaphthalenes. In an alternative approach to effect
stannylation, a palladium(0)-mediated coupling reaction using hexaalkylditin
reagents was examined. The Stille coupling reaction between naphthyl stannanes
(23) and (25) and the corresponding bromonaphthalenes (11) and (24) failed to
effect coupling to the desired binaphthyls.
描述了带有正甲氧基取代基的含氧萘烷的制备方法,包括
描述了带有正甲氧基取代基的含氧萘烷的制备方法,包括
(23) 和 (25),它们是合成二聚吡喃萘醌类抗生素的关键中间体。
二聚吡喃萘醌抗生素的关键中间体。锡烷 (17)、(19) 和
(21)-(23)是通过金属卤素交换相应的溴萘而获得的。
相应的溴萘。在实现
钯(0)介导的偶联反应。
试剂介导的偶联反应。萘烷(23 和 25)与六烷基二硝基试剂之间的 Stille 偶联反应
(23) 和 (25) 与相应的溴萘 (11) 和 (24) 之间的 Stille 偶联反应未能
与所需的二萘偶联。