Tandem Parham cyclisation––α-amidoalkylation reaction in the synthesis of the isoindolo[1,2- a ]isoquinoline skeleton of nuevamine-type alkaloids
作者:Iñaki Osante、Esther Lete、Nuria Sotomayor
DOI:10.1016/j.tetlet.2003.11.122
日期:2004.2
C-12b substituted isoindolo[1,2-a]isoquinolones 4 are prepared efficiently via a tandem Parham cyclisation-alpha-amidoalkylation reaction. Thus, Parham cyclisation on imide I generates a 12b-hydroxy isoindolo[1,2-a]isoquinolone, which is an immediate precursor of an N-acyliminium ion. Intermolecular alkylation with different pi-nucleophiles (allyl silanes or enol ethers) is accomplished upon treatment with Lewis acids (BF3.OEt2, TiCl4) to obtain nuevamine-type derivatives in high yields (69-95%) under mild conditions. (C) 2003 Elsevier Ltd. All rights reserved.
Functionalized organolithium compounds: Generation via reductive lithiation and nucleophilic addition to N-phenethylimides. Access to functionalized dihydropyrrolo[2,1-a]isoquinolinones
作者:Izaskun Manteca、Begoña Etxarri、Ainhoa Ardeo、Sonia Arrasate、Iñaki Osante、Nuria Sotomayor、Esther Lete
DOI:10.1016/s0040-4020(98)00745-5
日期:1998.10
sulfides. Nucleophilicaddition of 4-lithio-2-(trimethylsilylmethyl)but-1-ene 1 and 2-(3-lithiopropyl)-2-trimethylsilyl-1,3-dithiane 2 thus prepared to N-phenethyl-cis-norbor-5-en-2,3-dicarboximide 9 afforded the corresponding α-hydroxy lactams in good yields. Besides, access to C-10b substituted α,β-unsaturated pyrroloisoquinolinones 3 was efficiently achieved via a tandem organolithium nucleophilic addition