共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
3.
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
4.
5.
6.
Giovanni Fronza Claudio Fuganti Piero Grasselli Giulio Marinoni 《Tetrahedron letters》1979,20(40):3883-3886
The enantiomeric alcohols () and (), obtained from (2,3) tartaric acid and, respectively, -threonine, have been used to construct the C6, enantiomeric deoxy amino sugar derivatives () and () 相似文献
7.
8.
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
9.
Although the hydrochloride of -4--butyl-1-phenyl--1-(N-piperidyl)cyclohexane crystallizes in the conformation with axial -butyl, it exists as an almost equimolar mixture of the two chair conformers in CD2 Cl2 solution. The position of equilibrium allows one to calculate ΔG°-Bu as ?4.9 kcal/mol. 相似文献
10.
13C-NMR spectral data on 6-aminohexyl glycosides of -β--galactopyranosyl-2-acetamido-2-deoxy-β--glucopyranose are pr 相似文献
11.
12.
By proper choice of Lewis acid and protecting group, the Lewis acid mediated addition of allyltri--butylstannane to the α-hydroxyaldehyde derivatives 1b and 1c can be controlled to give excellent (95:5 to > 250:1) stereoselectivity for the formation of either or products. 相似文献
13.
14.
15.
A stereospecific, highly efficient, generally applicable synthesis of - and -1-alkoxy-1,3-butadienes involving dehydrative decarboxylations of 4,5-unsaturated-2-alkoxy-3-hydroxy-carboxylic acids is described. 相似文献
16.
17.
18.
19.
20.
Alkylation of dibutylstannylene complexes of 3,4,6-tri--benzyl--mannopyranose, methyl 6--trityl-α--mannopyranoside and methyl α--mannopyranoside gives respectively β--mannopyranoside and 3--alkyl derivatives with high selectivity. 相似文献