A Versatile and Highly Stereoselective Access to Vinyl Triflates Derived from 1,3-Dicarbonyl and Related Compounds
作者:Simon Specklin、Philippe Bertus、Jean-Marc Weibel、Patrick Pale
DOI:10.1021/jo8015049
日期:2008.10.3
trialkylamines or DBU followed by trapping with triflic anhydride probably accounted for such high selectivity, achieved even at 0 degrees C. This method offers the first direct route to vinyl triflates from beta-ketoamides, beta-ketophosphonates and beta-ketosulfones.
1,3-二羰基衍生物,例如1,3-二酮,β-酮醛,β-酮酸酯,β-酮酰胺,β-酮膦酸酯和β-酮砜被高效地转化为相应的具有高立体选择性的Z乙烯基三氟甲磺酸酯。在二氯甲烷中用三氟甲磺酸锂进行预配位,然后用温和的碱(例如三烷基胺或DBU)进行烯化,然后用三氟甲磺酸酐进行捕获,可能导致如此高的选择性,即使在0摄氏度下也是如此。这种方法为从β-酮酰胺制得三氟甲磺酸三氟甲磺酸酯提供了第一条直接途径,β-酮膦酸酯和β-酮砜。