A facile three-step synthesis of (±)-crispine A via an acyliminium ion cyclisation
摘要:
A high yielding cyclisation of the readily available N-(4,4-diethoxybutyl)-2-(3,4-dimethoxyphenyl)acetamide to 8,9-bis(methyloxy)-2,3,6, 10b-tetrahydropyrrolo[2, I-a]isoquinolin-5(1H)-one is described. The latter can be reduced with either AlH3 or BH3 to (+/-)-crispine A in an overall yield of 55%. (c) 2006 Elsevier Ltd. All fights reserved.
A facile three-step synthesis of (±)-crispine A via an acyliminium ion cyclisation
摘要:
A high yielding cyclisation of the readily available N-(4,4-diethoxybutyl)-2-(3,4-dimethoxyphenyl)acetamide to 8,9-bis(methyloxy)-2,3,6, 10b-tetrahydropyrrolo[2, I-a]isoquinolin-5(1H)-one is described. The latter can be reduced with either AlH3 or BH3 to (+/-)-crispine A in an overall yield of 55%. (c) 2006 Elsevier Ltd. All fights reserved.
An investigation into the electrophilic cyclisation of N-acyl-pyrrolidinium ions: a facile synthesis of pyrrolo-tetrahydroisoquinolones and pyrrolo-benzazepinones
作者:Frank D. King、Abil E. Aliev、Stephen Caddick、Royston C. B. Copley
DOI:10.1039/b907400g
日期:——
N-arylethyl-acylpyrrolidinium ions gave moderate to good yields of pyrrolo-tetrahydroisoquinolones and pyrrolo-benzazepinones respectively. Electron-donating R substituents enhanced the rate of reaction and gave higher yields than electron-withdrawing substituents. Substituents on the methyl or ethyl chain in general enhanced the reaction, unless sterically encumbered. The equivalent acylpiperidinium ions cyclised much