A new synthetic route to optically active unsaturated gamma- and delta-lactones has been demonstrated via asymmetric allylic carboxylation with a planar-chiral Cp'Ru catalyst and ring-closingmetathesis reaction with a Grubbs II catalyst, and successfully applied to the enantioselective synthesis of (R)-(-)-massoialactone.
Catalytic Use of Selenium Electrophiles in Cyclizations
作者:Danielle M. Browne、Osamu Niyomura、Thomas Wirth
DOI:10.1021/ol071223y
日期:2007.8.1
[GRAPHICS]A new and convenient one-pot method for a catalytic addition-elimination reaction using selenium electrophiles has been developed. In the presence of 5 mol % diphenyl diselenide, [bis(trifluoroacetoxy)iodo]benzene in acetonitrile converted a range of (E)-3-butenoic acids into the corresponding butenolides in good yields.
BARTLETT P. A., J. AMER. CHEM. SOC. <JACS-AT>, 1976, 98, NO 11, 3305-3312