Indoles, IV 9-Substituted 4,9-Dihydropyrano[3,4-b]indol-1(3H)-ones - Synthesis and Conversion into 2,3,4,9-Tetrahydro- 1H-pyrido-[3,4-b]indoles
作者:Adel A. El-Gendy、Jochen Lehmann
DOI:10.1002/ardp.19873200806
日期:——
Pyrano[3,4‐b]indolones 3a‐d are available from α‐ethoxyalyllactones 1a, c and disubstituted hydrazines 2a, b without isolation of intermediates. In a two‐phase system, however, the intermediate hydrazones 4a, c can be isolated. Conversion of 3a‐d into β‐carbolines was not possible by lactamisation but via the amides 8 and 9.
Pyrano [3,4-b] indolones 3a-d 可从 α-乙氧基烯丙基内酯 1a、c 和二取代肼 2a、b 获得,无需分离中间体。然而,在两相系统中,可以分离中间腙4a、c。3a-d 转化为 β-咔啉不可能通过内酰胺化,而是通过酰胺 8 和 9。