作者:Umesh A. Kshirsagar、Regev Parnes、Hagit Goldshtein、Rivka Ofir、Raz Zarivach、Doron Pappo
DOI:10.1002/chem.201300389
日期:2013.9.27
An iron‐based cross‐dehydrogenative coupling (CDC) approach was applied for the diversity‐oriented synthesis of coumestrol‐based selectiveestrogenreceptormodulators (SERMs), representing the first application of CDC chemistry in natural product synthesis. The first stage of the two‐step synthesis of coumestrol involved a modified aerobic oxidative cross‐coupling between ethyl 2‐(2,4‐dimethoxybenzoyl)acetate
Ligand-Controlled Iron-Catalyzed Coupling of α-Substituted β-Ketoesters with Phenols
作者:Regev Parnes、Umesh A. Kshirsagar、Aviya Werbeloff、Clil Regev、Doron Pappo
DOI:10.1021/ol301297k
日期:2012.7.6
A chemo-, regio-, and stereoselective FeCl3/1,10-phenanthroline-catalyzed cross dehydrogenative coupling (CDC) reaction between phenols and alpha-substituted beta-ketoesters was developed. The reaction creates a new quaternary carbon center within a polycyclic hemiacetal or polycyclic spirolactone architecture. The applicability of the new method to the synthesis of natural products was demonstrated by a possible biomimetic synthesis of the lachnanthospirone core.
Iron-Catalyzed Tandem Oxidative Coupling and Annulation: An Efficient Approach to Construct Polysubstituted Benzofurans
作者:Xingwei Guo、Rong Yu、Haijun Li、Zhiping Li
DOI:10.1021/ja907568j
日期:2009.12.2
isotopic effect indicated that aromatic C-H bond cleavage is not involved in the rate-determining steps of the present transformation. Moreover, the results clearly demonstrate that the dichotomous catalytic behavior of the iron catalyst, which is transition-metal catalyst in the oxidative coupling step and Lewis acid in the condensation step. The possible intermediate 5 was synthesized and converted