Benzofurans or Isochromenes via the Ring-Opening Cyclization of Cyclopropene Derivatives with Organolithiums
摘要:
A new and efficient approach to benzocycles from cyclopropene derivatives is described. Deprotection by organolithiums and subsequent ring-opening cyclization of the related 2-cyclopropenyl phenyl or benzyl acetates generated benzofurans and isochromenes in one pot.
Broad scope gold(<scp>i</scp>)-catalysed polyenyne cyclisations for the formation of up to four carbon–carbon bonds
作者:Zhouting Rong、Antonio M. Echavarren
DOI:10.1039/c7ob00235a
日期:——
The polycyclisation of polyenynes catalyzed by gold(I) has been extended for the first time to the simultaneous formation of up to four carbon–carbon bonds, leading to steroid-like molecules with high stereoselectivity in a single step with low catalyst loadings. In addition to terminal alkynes, bromoalkynes can also be used as initiators of polyene cyclisations, giving rise to synthetically useful
Metal-Free Synthesis of Indolopyrans and 2,3-Dihydrofurans Based on Tandem Oxidative Cycloaddition
作者:Subin Choi、Hyeonji Oh、Jeongwoo Sim、Eunsoo Yu、Seunghoon Shin、Cheol-Min Park
DOI:10.1021/acs.orglett.0c01896
日期:2020.7.17
transfer between coupling partners followed by cage collapse allows highly selective cross-coupling while employing only equimolar amounts of coupling partners. Moreover, the mechanistic manifold was expanded for the functionalization of enamines to give the stereoselective synthesis of 2,3-dihydrofurans. This iodine-mediatedoxidative coupling features mild conditions and fast reaction kinetics.
Benzofurans or Isochromenes via the Ring-Opening Cyclization of Cyclopropene Derivatives with Organolithiums
作者:Yu Liu、Shengming Ma
DOI:10.1021/ol2032009
日期:2012.2.3
A new and efficient approach to benzocycles from cyclopropene derivatives is described. Deprotection by organolithiums and subsequent ring-opening cyclization of the related 2-cyclopropenyl phenyl or benzyl acetates generated benzofurans and isochromenes in one pot.