Vilsmeier reagent (DMF-POCl3) was used as an efficient formylating agent. Several sterols having sec-hydroxyl group at 3/17-position have been modified into respective formate esters. The method is simple, mild, chemoselective and provides sec-alcoholic protection in good yields. (c) 2006 Elsevier Inc. All rights reserved.
ortho-Formylation of estrogens. Synthesis of the anti-cancer agent 2-methoxyestradiol
作者:Øyvind W. Akselsen、Trond Vidar Hansen
DOI:10.1016/j.tet.2011.08.005
日期:2011.10
Several estrogens were mono-formylated using a mixture of paraformaldehyde. MgCl2, and Et3N in refluxing THF. In all cases, the 2-isomer was formed as the major product with high regioselectivity compared to the 4-isomer. Excellent to high yields were obtained in all examples except one. The method was applied for an efficient synthesis of the anti-cancer agent 2-methoxyestradiol. (C) 2011 Elsevier Ltd. All rights reserved.
Cu(II) complex of an estradiol derivative with potent anti-inflammatory properties
作者:Dimitris M. Spyriounis、Eleni Rekka、Vassilis J. Demopoulos、Panos N. Kourounakis
DOI:10.1002/ardp.2503240902
日期:——
study, the A‐ring of estradiol was converted to an acetylsalicylic structure which was further complexed with Cu(II). The aim was to combine the anti‐inflammatory properties of estrogens with those of Cu(II) complexes. Key intermediate of the synthesis was 2‐formyl‐estradiol (2) which was prepared in quantitative yield through reaction of the phenoxymagnesium bromide of estradiol with formaldehyde in