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Updated: Jun 26, 2026

Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts
Published on: February 24, 2015
Synthesis of (+)- and (-)-monanchorin
1Department of Chemistry MS 015, Brandeis University, Waltham, Massachusetts 02454-9110, USA.
Abstract:
The optically pure epoxy acetal was converted to the protected guanidino alcohol by reaction with NaN(3) in DMF, hydrogenation of the azide, and reaction of the amine with MeSC(NBoc)NHBoc, AgNO(3), and Et(3)N. Treatment of the protected guanidino alcohol with 9:1 CDCl(3)/TFA afforded monanchorin, whose absolute stereochemistry was assigned as shown.
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