Traceless synthetic approach towards oxaza-dicyclopenta[a,h]naphthalenes under solvent-free condition: a basic alumina-supported green protocol
摘要:
A novel class of oxaza-dicyclopenta[a,h]naphthalenes was efficiently constructed from furo[3,2-h]quinoliniums through a 1,3-dipolar cycloaddition reaction employing basic alumina as the solid support. The distinguished features of this methodology encompass high yield, minimal reaction time, operational simplicity and general applicability coupled with structural novelty of the products. The intermediate furo[3,2-h]quinoliniums were easily derived through a two-step methodology, namely a tandem Sonogashira-alkynylation-cyclization, followed by quaternization of the furo[3,2-h]quinoline scaffold. (C) 2013 Elsevier Ltd. All rights reserved.
Copper–phenanthroline catalysts for regioselective synthesis of pyrrolo[3′,4′:3,4]pyrrolo[1,2-<i>a</i>]furoquinolines/phenanthrolines and of pyrrolo[1,2-<i>a</i>]phenanthrolines under mild conditions
作者:Rupankar Paira、Tarique Anwar、Maitreyee Banerjee、Yogesh P Bharitkar、Shyamal Mondal、Sandip Kundu、Abhijit Hazra、Prakas R Maulik、Nirup B Mondal
DOI:10.3762/bjoc.10.62
日期:——
A new series of pyrrolo[3',4':3,4]pyrrolo[1,2-a]furoquinolines/phenanthrolines and pyrrolo[1,2-a]phenanthrolines were efficiently built up from an 8-hydroxyquinoline derivative or phenanthroline via 1,3-dipolar cycloaddition reaction involving non-stabilized azomethine ylides, generated in situ from the parent furo[3,2-h]quinoliniums/phenanthroliums, in presence of a copper(II) chloride-phenanthroline