本文简要介绍用几种方法立体选择性合成三和四取代烯烃。
This paper reports briefly stereoselective synthesis of tri and tetra-substituted ethylenes by some methods.
综述了酶催化立体选择性合成及动力学折分制备旋光性氰醇的几种方法。
Several enzymatic methods, including enzyme catalyzed enantioselective synthesis and kinetic resolution, for the preparation of optically active cyanohydrins are reviewed.
高立体选择性合成反式-2，5-二取代四氢呋喃是期待解决的关键问题。
The key problem is to synthesize high stereoselectively trans- 2,5- disubstituted tetrahydrofurans.
生物催化因其高效和高度的立体选择性，成为手性合成最重要的方法之一。
Biocatalysis has become one of the most promising and effective methods in the asymmetric synthesis for its outstanding stereochemical specificity.
键的立体选择性形成是有机合成化学的重要方面。
The stereoselective formation of c-c bonds is a central aspect of organic synthetic chemistry.
立体选择性化合物的制备是当代有机合成化学中非常重要而且具有挑战性的领域之一。
The preparation of stereospecific compounds is an important and challenging area of contemporary synthetic organic chemistry.
综述了在有机合成领域中，通过炔烃立体选择性还原制备Z-或E-烯烃的近期方法。
This article reviews recent methods used in organic synthesis for the stereoselective reduction of alkynes to Z or E alkenes.
脂肪酶具有宽的底物专一性、高的立体选择性，在生物有机不对称合成中扮演着重要的角色。
Lipase has wide specificity for substrate, high stereoselectivity and plays very important role in the bioorganic synthesis.
结论3，5 二硝基苯甲酰氧基作为良好的糖端基离去基用于寡糖的合成，具有反应条件温和、收率较高、立体选择性好的特点。
Conclusion The 3, 5-dinitrobenzoyl group was found to be a good leaving group at the anomeric position and O-glucopyranosides and oligosaccharides were stereoselectively synthesized in good yield.
最后我们选用异二丙胺锂（LDA）为碱，在干冰丙酮浴下，合成了烯醇磷酸酯，并有很高的立体选择性。
At last , we used the base: LDA, dry ice-acetone bath , to synthesize the enol phosphates and gain very high rigio-selectivity.
具有反应条件温和，立体专一性或对映体选择性好的酶催化反应已在有机合成中得到广泛的应用。
Enzyme-catalyzed reactions which operate under mild reaction conditions with stereospecificity or enantioselectivity have been Widely used in organic synthesis.
生物催化的还原反应能使分子内的羰基或碳-碳双键立体选择性的还原，将潜手性底物转化为手性产物，在不对称合成中有着重要的作用。
Biocatalytic reduction of the carbonyl groups or the carbon-carbon double bonds of the compounds has been utilized as a method for transforming the prochiral substrate into chiral product.
研究了烷基苯基硅铜酸盐与2-环烯酮的1，4-加成反应的立体选择性，并合成了一系列新的2-取代-3-硅基环烷酮。
The stereoselectivity of 1,4-addition of dialkylphenylsilyl cuprates to 2-cycloenones was investigated and meantime a series of new 2-substituted-3-silylcycloalkanones were synthesized.
研究了烷基苯基硅铜酸盐与2-环烯酮的1，4-加成反应的立体选择性，并合成了一系列新的2-取代-3-硅基环烷酮。
The stereoselectivity of 1,4-addition of dialkylphenylsilyl cuprates to 2-cycloenones was investigated and meantime a series of new 2-substituted-3-silylcycloalkanones were synthesized.
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