[structure: see text] The first synthesis of premisakinolide A, the monomeric counterpart of misakinolide A, the marine 40-membered macrolide displaying potent activity against a variety of human carcinoma cell lines, has been reported. The strategy was highlighted by a crucial coupling of a tetrahydropyran fragment and an alkynylaluminum reagent having a polypropionate chain, the highly stereoselective
Potential and Limitations of Palladium–Cinchona Catalyst for the Enantioselective Hydrogenation of a Hydroxymethylpyrone
作者:W.-R. Huck、T. Mallat、A. Baiker
DOI:10.1006/jcat.2000.2890
日期:2000.7
palladium-catalyzed enantioselectivehydrogenation of 4-hydroxy-6-methyl-2-pyrone afforded up to 85% excess to the (S)-enantiomer of the corresponding 5,6-dihydropyrone, under very mild conditions (1 bar, room temperature). This is the highest enantioselectivity achieved so far with chirally modified Pd, demonstrating the potential of this catalyst in the enantioselectivehydrogenation of unsaturated compounds
Asymmetric hydrogenation of methyl 3,5-dioxohexanoate catalyzed by ru-binap complex: a short step asymmetric synthesis of dihydro-60methyl-2-H-pyran-2-one
Hydrogenation of methyl 3,5-dioxohexanoate 3 using Ru2Cl4((R) or (S)-binap)2(NEt3) as the catalyst gave dominantly anti 3,5-dihydroxyester 9, which was then converted into unsaturated lactone 4. The pathway of the hydrogenation reaction was also investigated.
BENNETT, FRANK;KNIGHT, DAVID W.;FENTON, GARRY, J. CHEM. SOC. PERKIN TRANS. PT 1,(1991) N, C. 133-140
作者:BENNETT, FRANK、KNIGHT, DAVID W.、FENTON, GARRY
DOI:——
日期:——
BENNETT, FRANK;KNIGHT, DAVID W.;FENTON, GARRY, TETRAHEDRON LETT., 29,(1988) N 38, C. 4865-4868