A short and efficient asymmetric synthesis of (−)-frontalin, (−)-exo-isobrevicomin and a volatile contributor of beer-aroma
作者:Surendra Singh、Patrick J. Guiry
DOI:10.1016/j.tet.2010.05.032
日期:2010.7
The natural products, (−)-frontalin and (+)-exo-isobrevicomin were synthesized employing Sharpless asymmetric epoxidation and ZrCl4-catalyzed intramolecular acetalization as the key steps. (−)-Frontalin was synthesized in three steps with a 61.4% overall yield and 89.9% ee and (−)-exo-isobrevicomin also obtained in an overall satisfactory yield of 10.1% and 97% ee. We have also synthesized the volatile
The absolute configuration of 6,8-dioxabicyclo[3.2.1]octane and several methyl substituted derivatives
作者:N. Ibrahim、T. Eggimann、E.A. Dixon、H. Wieser
DOI:10.1016/s0040-4020(01)81959-1
日期:1990.1
enantiomers of 6,8-dioxabicyclo[3.2.1]octane and the alkyl substituted derivatives, exo- and endo-7-methyl, exo- and endo-5,7-dimethyl, 7,7-dimethyl, and exo- and endo-7-ethyl-5-methyl (exo- and endo-brevicomin), were synthesized stereoselectively with known configuration by standard synthetic methods, or with baker's yeast, or both. The correlation between the absoluteconfiguration of the bicyclic rings and
On the scope of asymmetric nitrile oxide cycloadditions with Oppolzer's chiral sultam. Total syntheses of (+)-hepialone, (-)-(1R,3R,5S)-1,3-dimethyl-2,9-dioxabicyclo[3.3.1]nonane, and (-)-(1S)-7,7-dimethyl-6,8-dioxabicyclo[3.2.1]octane
作者:Dennis P. Curran、Timothy A. Heffner
DOI:10.1021/jo00302a023
日期:1990.7
IBRAHIM, N.;EGGIMANN, T.;DIXON, E. A.;WIESER, H., TETRAHEDRON, 46,(1990) N, C. 1503-1514
作者:IBRAHIM, N.、EGGIMANN, T.、DIXON, E. A.、WIESER, H.
DOI:——
日期:——
CURRAN, DENNIS P.;HEFFNER, TIMOTHY A., J. ORG. CHEM., 55,(1990) N5, C. 4515-4595