Formation of spiro indane derivatives from hydroxy lactams derived from N-(1-phenylethyl)-phthalimide and -pyridine-2,3-dicarboximide
作者:Abood A. Bahajaj、John M. Vernon
DOI:10.1039/p19960001041
日期:——
Spiro[indane-1,7′-pyrrolo[3,4-b]pyridin]-5′-ones 18–22 are formed by acid-catalysed rearrangement from 7-aryl-7-hydroxy-6-(1-phenylethyl)-6,7-dihydropyrrolo[3,4-b]pyridin-5-ones. Further spiro indanes 39, 43 and 44 and spiro naphthalenes 41, 42, 45 and 46 are obtained from 3-(ω-phenylalkyl)-3-hydroxy-2-(1-phenylethyl)isoindolin-1-ones or from 7-(ω-phenylalkyl)-7-hydroxy-6-(1-phenylethyl)-6,7-dihydropyrrolo[3,4-b]pyridin-5-ones viaα,α-cyclisation of N-acyliminium ion intermediates.
Spiro[indane-1,7′-吡咯[3,4-b]吡啶]-5′-酮18–22是通过酸催化重排由7-芳基-7-羟基-6-(1-苯乙基)-6,7-二氢吡咯[3,4-b]吡啶-5-酮形成的。进一步的螺旋印地烯39、43和44,以及螺旋萘烯41、42、45和46是通过3-(ω-苯基烷基)-3-羟基-2-(1-苯乙基)异吲哚-1-酮或由7-(ω-苯基烷基)-7-羟基-6-(1-苯乙基)-6,7-二氢吡咯[3,4-b]吡啶-5-酮通过N-酰基铵离子中间体的α,α-环化作用获得的。