An efficient synthesis of the C1-C19 segment of carolacton is described, starting from D-ribose, (-)-beta-citronellene and a homopropargylic alcohol, and which employs a Nozaki-Hiyama-Kishi (NHK) coupling as the key step. Other important steps are cross-metathesis and Evans aldol reactions.
An efficient synthesis of the C1-C19 segment of carolacton is described, starting from D-ribose, (-)-beta-citronellene and a homopropargylic alcohol, and which employs a Nozaki-Hiyama-Kishi (NHK) coupling as the key step. Other important steps are cross-metathesis and Evans aldol reactions.
Strategic use of nickel(0)-catalyzed enyne–epoxide reductive coupling toward the synthesis of (−)-cyatha-3,12-diene
作者:Brian A. Sparling、Graham L. Simpson、Timothy F. Jamison
DOI:10.1016/j.tet.2008.11.086
日期:2009.4
Various situations are explored in which the nickel(0)-catalyzed enyne–epoxide reductive coupling was utilized to access key intermediates toward the total synthesis of (−)-cyatha-3,12-diene (1). Enantioenriched 3,5-dien-1-ols with a variety of functionality were obtained in a straightforward manner from easily accessible 1,3-enynes and terminal epoxides.