Highly Regioselective Synthesis of 1,3-Diiodonaphthalene Derivatives via a Sequential Cascade Iodocyclization
摘要:
A novel and flexible sequentially cascade iodocyclization for the synthesis of highly substituted 1,3-diiodinated naphthalene derivatives in up to 99% yield under mild conditions is reported. The dihalogenated moiety can be readily introduced into the naphthalenes in a position that is usually not easily functionalized.
Gold-Catalyzed Oxidative Cyclizations of {<i>o</i>-(Alkynyl)phenyl propargyl} Silyl Ether Derivatives Involving 1,2-Enynyl Migration: Synthesis of Functionalized 1<i>H</i>-Isochromenes and 2<i>H</i>-Pyrans
作者:Jidong Zhao、Wei Xu、Xin Xie、Ning Sun、Xiangdong Li、Yuanhong Liu
DOI:10.1021/acs.orglett.8b02380
日期:2018.9.7
A new and convenient strategy for the synthesis of functionalized 1H-isochromene and 2H-pyran derivatives based on gold-catalyzed oxidative cyclizations of o-(alkynyl)phenyl propargyl ether derivatives has been developed. The reaction proceeds via gold-catalyzed highly regioselective oxidation, followed by 1,2-migration of an enynyl group and nucleophlic addition. Isocoumarins were also constructed
Gold-catalyzed cyclization of 1,6-diynyl dithioacetals via 1,7-carbene transfer and aromatic C–H functionalization
作者:Wei Xu、Ming Chen、Ning Sun、Yuanhong Liu
DOI:10.1039/c6cc05302e
日期:——
A gold-catalyzed cyclization of 1,6-diynyl dithioacetals has been developed, which provides an attractive route to diverse-substituted benzo[a]fluorene derivatives. The reaction is initiated through 1,2-sulfur migration of propargyl dithioacetal moiety to...
Gold(I)-Catalyzed Regioselective Cyclization to Access Cyclopropane-Fused Tetrahydrobenzochromenes
作者:Perla Bharath Kumar、Chittala Emmaniel Raju、Patel Hinal Chandubhai、Balasubramanian Sridhar、Galla V. Karunakar
DOI:10.1021/acs.orglett.2c02564
日期:2022.9.23
Gold(I)-catalyzedefficient synthetic transformation was achieved to access the tetrahydrobenzo[h]cyclopropa[c]chromenes from allyl-substituted 1,6-diynes. Cyclopropane-fused tetrahydrobenzochromenes were obtained regioselectively in ≤92% yields. In this atom-economic organic transformation, three new C–C bonds were formed sequentially in one pot.
实现了金(I)催化的高效合成转化,以从烯丙基取代的 1,6-二炔中获得四氢苯并[ h ]环丙[ c ]色烯。以≤92% 的产率区域选择性地获得了环丙烷稠合的四氢苯并色烯。在这种原子经济有机转化中,三个新的 C-C 键在一锅中依次形成。