作者:Nobuhiro Kanomata、Shinsuke Yamada、Takayuki Ohhama、Akira Fusano、Yoshiharu Ochiai、Jun Oikawa、Masahiro Yamaguchi、Fumio Sudo
DOI:10.1016/j.tet.2006.02.002
日期:2006.4
Synthesis of various bridged nicotinates 6 having [n](2,5)pyridinophane skeletons (n=8–14) was accomplished by the unique pyridine-formation reaction of methyl propiolate with a series of formyl-substituted (vinylimino)phosphoranes 5, which were prepared from the corresponding cycloalkanones 1 via Vilsmeier–Haack formylation giving chloro-substituted cycloalkenals 2, their thermal and photochemical
各个桥接烟酸酯的合成6具有[ Ñ ](2,5)pyridinophane骨架(Ñ = 8-14)是通过用一系列甲酰基-取代的(vinylimino)的丙炔酸甲酯的独特吡啶形成反应完成膦5,其由相应的环烷酮1通过Vilsmeier-Haack甲酰化制备,得到氯取代的环烯醛2,其热和光化学转化为甲酰基叠氮4,随后与三苯基膦发生开环反应。[11](2,5)吡啶oph衍生物(S p,S)-14的HPLC分析和(R p,S)-14,表明这些非对映异构体在室温下会迅速发生自身异构化,并且与相应的[11](2,5)环烷体系相比,它们的平面手性在热力学上不稳定。