Novel Syntheses of Hexahydro-1<i>H</i>-pyrrolo[1,2-<i>a</i>]imidazoles and Octahydroimidazo[1,2-<i>a</i>]pyridines
作者:Alan R. Katritzky、Guofang Qiu、Hai-Ying He、Baozhen Yang
DOI:10.1021/jo991881z
日期:2000.6.1
)hexahydro-1H-pyrrolo[1,2-a]ĭmidazole (18) and 1-phenyl-5-benzotriazolyloctahydroimidazo[1,2-a]pyridine (27) were readily prepared from succindialdehyde or glutaraldehyde, benzotriazole, and N-phenylethylenediamine. Synthons 18 and 27 reacted with Grignard reagents, allylsilanes, silyl ethers, and triethyl phosphite to produce 1-phenyl-5-substituted-hexahydro-1H-pyrrolo[1,2-a]ĭmidazoles 20a-f, 22,
1-苯基-5-(苯并三唑-1-基)六氢-1H-吡咯并[1,2-a]ĭ咪唑(18)和1-苯基-5-苯并三唑基五氢咪唑并[1,2-a]吡啶(27)由琥珀二醛或戊二醛,苯并三唑和N-苯基乙二胺制备。合成子18和27与格利雅试剂,烯丙基硅烷,甲硅烷基醚和亚磷酸三乙酯反应生成1-苯基-5-取代-六氢-1H-吡咯并[1,2-a]ĭ咪唑20a-f,22、24a,b,以及25和1-苯基-5-取代的八氢咪唑并[1,2-a]吡啶28a-e,32、33a,b和34的产率非常好。通过NOE实验确定20、22、24和25的构型为顺式异构体,而(1)H-(1)阐明28a-e,32、33a,b和34的构型和构象。 H COZY和(1)H-(13)C COSY。