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区域选择性合成
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  regioselective synthesis
     Study on Regioselective Synthesis of Mononitrochlorobenzene on SO_4~(2-)/WO_3-ZrO_2 Catalysts
     SO_4~(2-)/WO_3-ZrO_2催化剂上硝基氯苯的区域选择性合成研究
短句来源
     Regioselective Synthesis and 2D NMR Research of Ethyl 2-Methylthio-7(5)-substituted Pyrazolo[1,5-a]pyrimidine-3-carboxylate
     2-甲硫基-7(5)-取代-3-吡唑并[1,5-a]嘧啶甲酸乙酯的区域选择性合成与2D NMR研究
短句来源
     Regioselective Synthesis Mechanism and Crystal Structure of 2′,4″-O-Bis(trimethylsilyl)-6-O-methylerythromycin A 9-O-(1-methoxycyclohexyl) oxime
     2′,4″-O-双(三甲基硅)-6-O-甲基红霉素A9-O-(1-甲氧基环己基)肟的区域选择性合成机理及其晶体结构
短句来源
     High Regioselective Synthesis of Para-Myrac Aldehyde in ZnCl_2 Ionic Liquids
     ZnCl_2离子液体中高区域选择性合成对位柑菁醛
短句来源
     Studies on Steroidal Plant-Growth Hormones VIII. The Regioselective Synthesis of Methyl 3α-Hydroxy-7-oxa-6-oxo-B-homo-5α-cholanate
     甾体植物生长促进剂的研究——Ⅷ.3α-羟基-7-氧-6-酮-B-高-5α-胆烷酸甲酯的区域选择性合成
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  regio-selective synthesis
     An Efficient Method for Regio-selective Synthesis of Mono-Schiff Base under Ultrasound Irradiation
     超声波辐射下区域选择性合成单齿席夫碱
短句来源
  “区域选择性合成”译为未确定词的双语例句
     Chemistry of Hyodeoxycholic Acid 7. Stereo- and Regio-selective Syntheses of (24R)-24,25-Dihydroxy-,(24R,25S)-24,25,26-Trihydroxy-and(25R)-25,26-Dihydroxycholesterol
     猪去氧胆酸化学 7.(24R)-24,25-双羟基(24R,25S)-24,25,26-三羟基和(25R)-25,26-双羟基胆固醇的立体选择性和区域选择性合成
短句来源
     Mono-Schiff base RCH=NCH_2CH_2NH_2 has been regioselectively synthesized under ultrasound irradiation in non-polar solvents CCl_4 with 92%-98% yields and characterized by NMR,MS,IR and elemental analysis.
     报道了在非极性溶剂如四氯化碳中,乙二胺与芳香醛在超声波辐射下高产率(92%~96%)区域选择性合成单齿席夫碱RCH=NCH2CH2NH2,并用NMR,MS,IR和元素分析对其结构进行表征.
短句来源
     Studies on Regiospecific Syntheses of Purine Libraries Via Sulfur Intermediates
     以含硫化合物为关键中间体区域选择性合成多取代嘌呤衍生物库的研究
短句来源
     Naringin was acylated at 6"-OH of glucose moiety catalyzed by Novozym 435 in 2-methyl-2-butanol.The controllable regio-selective acylation of rutin was proposed. An efficient synthesis of rutin esters has been developed. Enzymatic selectivity was affected by substrate and solvent. Alkaline protease from Bacillus subtilis obtained 3"-O-substituted rutin esters in pyridine, Novozym 435 provided 4'''-O-substituted rutin esters products in tert-butanol.
     论文建立了酶催化卢丁衍生物可控区域选择性合成方法,通过研究酶和溶剂对反应的影响,发现在吡啶中枯草杆菌蛋白酶催化三种脂肪酸二乙烯酯和五种脂肪酸乙烯酯与卢丁反应都得到3”-位取代产物; 而在叔丁醇中,Novozym435酶只催化脂肪酸二乙烯酯与卢丁反应得到4’”-位取代产物。
短句来源
     The aeylation of 5-methyl-3-hydroxyisoxazole(1) with 3-methyl-2-(4'-chlorophenyl) butyryl chloride (2a) has been studied under different reaction conditions. Synthetic methods, solvents, acid-binding agents and reagent stoichiometry exhibit significant influence on the ratio of O-/N- acylation products of 1.O-or N-regioselective acylations of 1 have been developed.
     本文研究了不同反应条件下3-羟基-5-甲基异噁唑(1)与3-甲基-2-对氯苯基丁酰氯(2a)的反应,提出了区域选择性合成O-和N-酰化产物的方法。
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  regioselective synthesis
Regioselective synthesis of alkyl derivatives of 3,5-diamino-1,2,4-triazole
      
New procedures were suggested for regioselective synthesis of alkyl derivatives of 3,5-diamino-1,2,4-triazole.
      
New Regioselective Synthesis of 1-Substituted 6-Alkyluracils
      
New regioselective synthesis of 1-amino-6-methyluracils
      
A regioselective synthesis was carried out of 7-trifluoromethylpyrazolo[1,5-a]pyrimidines by reaction of 3(5)aminopyrazoles with 1,3-diketones containing CF3 group.
      
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A series of (Z,Z)-tetraaryl-1, 3-butadiene has been synthesized stereospecifically and regioselectively by acidolysis of five-membered Ti, Zr metallocycles formed from asymmetrically substituted ethynes. The structures of these products have been proved by physical and chemical methods.

经五元钦、锆杂环,由非对称炔烃,区域选择性地合成了一系列立体专一的(Z,Z)-四芳基-1,3-丁二烯,并通过物理、化学方法证明了产物结构.

The aeylation of 5-methyl-3-hydroxyisoxazole(1) with 3-methyl-2-(4'-chlorophenyl) butyryl chloride (2a) has been studied under different reaction conditions. Synthetic methods, solvents, acid-binding agents and reagent stoichiometry exhibit significant influence on the ratio of O-/N- acylation products of 1.O-or N-regioselective acylations of 1 have been developed. Acylation of 1 in the presence of triethylamine in acetonitrile yielded O-acylated regioisomers 3a~3e with content 88~96%. The trimethylsilyl enol...

The aeylation of 5-methyl-3-hydroxyisoxazole(1) with 3-methyl-2-(4'-chlorophenyl) butyryl chloride (2a) has been studied under different reaction conditions. Synthetic methods, solvents, acid-binding agents and reagent stoichiometry exhibit significant influence on the ratio of O-/N- acylation products of 1.O-or N-regioselective acylations of 1 have been developed. Acylation of 1 in the presence of triethylamine in acetonitrile yielded O-acylated regioisomers 3a~3e with content 88~96%. The trimethylsilyl enol ether of 1 reacted with acid chloride 2a~2i in benzene to afford N-acylated regioisomers 5a~5i with content 86~96%.It was also found that acyl-transfer between O-and N-atom on products occurred in the presence of DMAP.

本文研究了不同反应条件下3-羟基-5-甲基异噁唑(1)与3-甲基-2-对氯苯基丁酰氯(2a)的反应,提出了区域选择性合成O-和N-酰化产物的方法。在三乙胺存在下,乙腈为溶剂,1和2a~2e反应得到含量为88~96%的O-酰化产物3a~3e;而若将1转化为相应的异噁唑硅醚4,再与2a~2i反应,则得到含量为86~97%的N-酰化产物5a~5i。试验表明,在DMAP催化下,3a和5a可发生O-/N-酰基转移反应。

This paper reports a stereo-and regio-selective syntheses of (24R)-24,25-dihydroxycholesterol (3b), (24R,25S)-24,25,26-trihydroxycholesterol (3c) and (25R)-25, 26-dihydroxycholesterol (3d) which are important intermediate for syntheses of Vitamin D3 metabolite and analogs, from methyl hyodeoxycholanate (2a). The key steps are stereoselective epoxidation of the allylic alcohol 6a and regioselective ring opening process of the epoxy alcohol 7a. The total yields are 27,27 and 38%, respectively.

本文报道以猪去氧胆酸甲酯(2a)为原料,立体选择性和区域选择性地合成了维生素D_3代谢产物及类似物的关键中间体(24O)-24,25-双羟基胆固醇(3b),(24O,25S)-24,25,26-三羟基胆固醇(3c)和(25O)-25,26-双羟基胆固醇(3d),总收率分别为27,27和38%.

 
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