ZnCl<sub>2</sub>-Promoted Intramolecular Hetero-Diels–Alder Reaction of <i>o</i>-Alkynylphenylcarbodiimides for Synthesis of Dihydrodibenzo[<i>b</i>,<i>g</i>][1,8]naphthyridines
作者:Noriki Kutsumura、Yasuaki Koyama、Kotaro Tateno、Naoshi Yamamoto、Hiroshi Nagase、Takao Saito
DOI:10.1248/cpb.c16-00363
日期:——
The ZnCl2-promoted intramolecular hetero Diels-Alder reaction of N-(ortho-propargylphenyl)-N'-arylcarbodiimides, in which the aryl-N=C moiety functioned as a 2-azabuta-1,3-diene, 4pi component, has been achieved. By this method, very rare 5,12-dihydrodibenzo[b,g][1,8]naphthyridines and fully aromatized dibenzo[b,g][1,8]naphthyridines were successfully synthesized.
N-(原炔丙基苯基)-N'-芳基碳二亚胺的ZnCl2促进的分子内杂Diels-Alder反应具有以下功能:其中芳基-N = C部分起2-azabuta-1,3-diene,4pi的作用实现了。通过这种方法,成功地合成了非常罕见的5,12-二氢二苯并[b,g] [1,8]萘啶和完全芳构化的二苯并[b,g] [1,8]萘啶。