New synthesis of a selective estrogen receptor modulator using an enatioselective phosphine-mediated 2+3 cycloaddition
作者:Debra J. Wallace、Robert A. Reamer
DOI:10.1016/j.tetlet.2013.06.023
日期:2013.8
A new synthetic approach to the selective estrogen agonist 1 is described. The key steps in the route are a phosphine catalyzed 2+3cycloaddition between an indanone enone and allenyl methyl ketone, and an unusual Robinson annulation to afford a bicylco[3.2.1]octane. The potential benefits of the new route are discussed along with efforts to render the approach asymmetric.
Development of a Phase Transfer Catalyzed Asymmetric Synthesis for an Estrogen Receptor Beta Selective Agonist
作者:Jeremy P. Scott、Michael S. Ashwood、Karel M. J. Brands、Sarah E. Brewer、Cameron J. Cowden、Ulf-H. Dolling、Khateeta M. Emerson、Andrew D. Gibb、Adrian Goodyear、Steven F. Oliver、Gavin W. Stewart、Debra J. Wallace
DOI:10.1021/op700178q
日期:2008.7.1
A practical asymmetric synthesis of the estrogen receptor beta selective agonist (7β-9aβ)-1,4-dichloro-2-hydroxygibba-1(10a),2,4,4b-tetraen-6-one (1), proceeding by way of six isolated intermediates and without recourse to chromatography, is described. Highlights of the process route developed are two chemoselective chlorinations, a lithiated hydrazone alkylation and an asymmetric Michael addition