First Total Synthesis of (−)-Ichthyothereol and Its Acetate
作者:Chisato Mukai、Naoki Miyakoshi、Miyoji Hanaoka
DOI:10.1021/jo0104532
日期:2001.8.1
The first and stereoselective total syntheses of (-)-ichthyothereol (1) and its acetate ((+)-2) were achieved by incorporation of the two chiral centers of diethyl L-tartrate. The starting diethyl L-tartrate was converted into trans-2-ethynyl-3-hydroxytetrahydropyran 14 in a stereoselective manner via the endo mode cyclization of the epoxy-alkyne derivative 12. The alcohol 12 was then transformed into
Total Syntheses of Naturally Occurring Diacetylenic Spiroacetal Enol Ethers
作者:Naoki Miyakoshi、Daisuke Aburano、Chisato Mukai
DOI:10.1021/jo050822k
日期:2005.7.1
A highly stereoselective method for constructing a (2E)-methoxymethylidene-1,6-dioxaspiro[4.5]decane skeleton has been developed on the basis of the palladium(II)-catalyzed ring-closing reaction of the 3,4-dioxygenated-9-hydroxy-1-nonyn-5-one derivatives as a crucial step. The newly developed procedures could be successfully applied to the first totalsynthesis of five diacetylenic spiroacetal enol