共查询到20条相似文献,搜索用时 15 毫秒
1.
All four isomers of substituted 3-alkylthio-4-hydroxybutenes have been synthesised: both the geometry of the double bond and the relative stereochemistry of the two chiral centres are controlled. 相似文献
2.
3.
4.
5.
6.
7.
8.
9.
N-Acyl derivatives of ,-acosamine and ,-ristosamine were synthesized with high stereo selectivity utilizing intramolecular Michael addition of γ- and δ-carbomoyloxy-α,β-unsaturated esters. 相似文献
10.
J Leitich 《Tetrahedron letters》1980,21(32):3025-3028
The relative rates of formation of and [2+2]cycloadducts of benzyne to , - and , -1,5-cyclooctadiene, - and -cyclooctene are discussed and properties of the adducts (e.g., their unusual hydrogenation) are described. 相似文献
11.
12.
13.
14.
15.
A new toxic metabolite was isolated from and the structure was determined by X-ray diffraction analysis. The metabolite was designated as paraherquamide. 相似文献
16.
The structure of engleromycin isolated from Hennings has been established as by spectral techniques. 相似文献
17.
18.
19.
The structure of a novel 2,3,4- trisubstituted furanoid lignan, designated sylvone, was established as from detailed spectroscopical and chemical studies. 相似文献
20.
Sterepolide and dihydrosterepolide, new sesquiterpenes isolated from the fungus , are assigned structures and , respectively. The assignments are based mainly on spectroscopic studies and similarities to isolactarorufin (). A possible mode of biogenesis of these isolactarane type sesquiterpenes is discussed. 相似文献