A formal homo-Nazarov cyclization of enantioenriched donor–acceptor cyclopropanes and following transformations: asymmetric synthesis of multi-substituted dihydronaphthalenes
Solvent-dependent oxidative coupling of 1-aryl-1,3-dicarbonyls and styrene
作者:Brian M. Casey、Cynthia A. Eakin、Jingliang Jiao、Dhandapani V. Sadasivam、Robert A. Flowers
DOI:10.1016/j.tet.2009.06.118
日期:2009.12
This report describes the scope and mechanism of the solvent-dependent, chemoselective oxidative coupling of 1-aryl-1,3-dicarbonyls with styrene using Ce(IV) reagents. Dihydrofuran derivatives are obtained when reactions are performed in methanol whereas α-tetralones can be selectively synthesized in acetonitrile and methylene chloride. Mechanistic studies are consistent with the rate of solvent-assisted
A formal homo-Nazarov cyclization of enantioenriched donor–acceptor cyclopropanes and following transformations: asymmetric synthesis of multi-substituted dihydronaphthalenes
Multi-substituted trans-dihydronaphthalenes were obtained in high ee from a TiCl4-mediated cyclization of enantioenriched D–A cyclopropanes, followed by a triflation of OH.
Construction of Polycyclic β-Ketoesters Using a Homoconjugate Addition/Decarboxylative Dieckmann Annulation Strategy
作者:Zhiwei Chen、Allen Y. Hong、Xin Linghu
DOI:10.1021/acs.joc.8b00754
日期:2018.6.1
arene-fused cyclic β-ketoesters from 2-iodoaryl esters and 1,1-cyclopropane diesters is detailed. The synthetic method takes advantage of a CuI·SMe2-mediated homoconjugate addition followed by a decarboxylative Dieckmann cyclization to afford valuable polycyclic building blocks. Various iodoaryl esters and 1,1-cyclopropane diesters were evaluated, and the limitations of both reactions are discussed. Several