番荔枝宁合成工艺

以3,4-二甲氧基苯乙腈为起始原料,分别由水解和氢化还原制备3,4-二甲氧基苯乙酸和3,4-二甲氧基苯乙胺,二者经酰化、Bischler-Napieralski环化、硼氢化钾还原制得中间体四氢罂粟碱,后同甲醛经Pictet-Spengler反应制得(±)-番荔枝宁。该法合成番荔枝宁的总收率为47%。     

基于硼氢化钾-三氟化硼乙醚还原体系的3,4-二甲氧基苯乙胺合成新方法

以邻苯二酚为原料,经醚化、Vilsmeier反应制得藜芦醛,收率95.2%,藜芦醛与硝基甲烷反应制得了3,4-二甲氧基苯基-β-硝基乙烯,收率高达93.6%,然后利用硼氢化钾-三氟化硼乙醚体系(KBH4/BF3-Et2O)催化还原3,4-二甲氧基苯基-β-硝基乙烯合成3,4-二甲氧基苯乙胺。该方法使用KBH4/F3B-Et2O还原体系,具有反应条件温和、后处理容易、产率较高等特点,适于工业化生产。     

5’-甲氧基劳丹素的合成

以3,4,5-三甲氧基苯乙酸为原料,二甲苯为溶剂,经缩合环合一锅法合成3,4-二氢-6,7-二甲氧基-1-[2-(3,4,5-三甲氧基苯基)乙基]异喹啉,再经碘甲烷甲基化、硼氢化钾还原制得标题化合物,总收率约63%(以3,4,5-三甲氧基苯乙酸计)。     

四氢罂粟碱合成

以3,4-二甲氧基苯乙胺2和3,4-二甲氧基苯乙酸3为原料,缩合、合环、还原等反应制得四氢罂粟碱,总收率81%,纯度96%以上(HPLC),工艺稳定,利于工业化生产。     

羟基酪醇的合成

以3,4-二甲氧基苯乙酸为起始原料,制得3,4-二羟基苯乙酸,3,4-二羟基苯乙酸再在SOCl2存在下与甲醇反应制得3,4-二羟基苯乙酸甲酯,以Bouveault-Blanc反应为基本原理,通过钠/乙醇还原3,4-二羟基苯乙酸甲酯制得羟基酪醇,并通过1HNMR、IR、MS等方法对其进行了表征。该文还对影响羟基酪醇收率的原料配比、反应时间、反应温度以及钠/乙醇还原3,4-二羟基苯乙酸甲酯反应的机理进行了研究和探讨。     

左旋泮托拉唑钠、镁的合成

探讨了左旋泮托拉唑钠、镁的合成。以麦芽酚(2-甲基-3-羟基-4-吡喃酮)为起始原料,经过甲基化、氨化、氯化、氧化、甲氧基化、重排、水解、氯化反应合成得到2-氯甲基-3,4-二甲氧基吡啶盐酸盐;以扑热息痛(对乙酰氨基酚)为原料经过醚化、硝化、还原、环合反应合成5-二氟甲氧基-2-巯基-1H-苯并咪唑;二者缩合制得5-二氟甲氧基-2-{[(3,4-二甲氧基-2-吡啶基)甲基]硫}-1H-苯并咪唑;以D-(-)-酒石酸二乙酯为手性试剂,过氧化异丙苯为氧化剂,不对称氧化制得S-(-)-5-二氟甲氧基-2-[(3,4-二甲氧基-2-吡啶基)甲基]亚硫酰基-1H-苯并咪唑;然后与氢氧化钠、氯化镁成盐制得左旋泮托拉唑钠和左旋泮托拉唑镁。通过该法得到了目标产物左旋泮托拉唑钠和左旋泮托拉唑镁,且该合成方法操作简便。     

左旋泮托拉唑钠的合成工艺研究

以2-氯甲基-3,4-二甲氧基吡啶盐酸盐与5-二氟甲氧基-2-巯基-1H-苯并咪唑为起始原料在氢氧化钠水溶液条件下缩合得到中间体5-二氟甲氧基-2-[[(3,4-二甲氧基-2-吡啶基)甲基]硫基]-1H-苯并咪唑,经过Sharpless不对称氧化得到粗品左旋泮托拉唑钠,再用丙酮重结晶,即可制得高纯度左旋泮托拉唑钠,总收率约65.5%,纯度99.90%。     

四氢罂粟碱的合成工艺改进

以3,4-二甲氧基苯基乙腈为起始原料,经水解、缩合、合环、氢化等反应制得四氢罂粟碱,总收率67.8%,纯度96%以上(HPLC),工艺稳定,利于工业化生产。     

几种3,4-二甲氧基苯丙酸酯的合成

以3,4-二甲氧基苯丙酸为原料,经酯化合成了未见报道的3,4-二甲氧基苯丙酸异丙酯,3,4-二甲氧基苯丙酸丙酯与3,4-二甲氧基苯丙酸薄荷酯,并用1H NMR、13C NMR谱对产物进行了表征.     

伊曲茶碱的合成工艺改进

以3,4-二甲氧基肉桂酸为起始物料,经缩合、成环和甲基化反应制得伊曲茶碱。反应总收率达61.3%,纯度达99.8%,目标化合物结构经MS和1H NMR确证。改进后的合成工艺操作简单,成本低,收率高,适合工业化生产。     

6-氟-色满-2-羧酸的合成

对-氟苯酚与硫酸二甲酯进行酚甲醚化得到对-氟苯甲醚,然后在AlCl3催化下与顺丁烯二酸酐进行Friedel-Crafts酰基化,进一步去甲基化得到4-（4-氟-2-苯酚）-4-氧代-2-丁烯酸,在碱性条件下,经自身环化得到6-氟-4-氧代-3,4-二氢-2H-1-苯并吡喃-2-甲酸,关环步骤的收率为81％;最后在乙酸介质中,用5％Pd／C催化加氢得到外消旋的6-氟-3,4-二氢-2H-1-苯并吡喃-2-羧酸。该工艺总收率为51．87％,具有合成路线短、收率高、原料易得、条件温和、操作简单的特点,适宜工业化生产。     

3,4-亚甲二氧苯基-2-丙酮的合成研究

以3,4-亚甲二氧基苯甲醛和硝基乙烷为原料,经Knoevenagel反应生成3,4-亚甲二氧苯基-2-硝基丙烯,再通过还原和水解反应,合成3,4-亚甲二氧苯基-2-丙酮。研究了Knoevenagel反应中催化剂的选择以及还原与水解反应中HCl与3,4-亚甲二氧苯基-2-硝基丙烯的摩尔比对产率的影响。结果表明,较优反应条件为:Knoevenagel反应采用醋酸铵作催化剂,冰醋酸作溶剂,回流3 h,产率可达81.2%;还原与水解反应中,HCl与3,4-亚甲二氧苯基-2-硝基丙烯的摩尔比为2.72∶1时,产率为66.3%。     

Thermal and catalytic aspects of Ln(III) polymer–metal complexes

BACKGROUND: In this era, polymer‐supported catalysts are gaining more attention, as they are effective in reduction of pollution, production cost and give good yield. Due to the versatility of lanthanide catalysts in organic synthesis, we envisioned that lanthanides(III) supported polymers would afford a novel type of solid phase Lewis acids. RESULTS: The polymer–metal complexes are found to be efficient and effective catalysts in the Biginelli three‐component, one‐pot synthesis of 3,4‐dihydropyrimidin‐2(1H)‐ones. The synthesized polymer is thermally more stable and porous in nature than polychelates. CONCLUSION: The polymer–metal complexes can be used as economical and eco‐friendly catalysts for synthesis of substituted 3,4‐dihydropyrimidin‐2(1H)‐ones with different aromatic aldehydes and β‐ketoesters. Thermal stability of the polymer is higher than that of polychelates due to the presence of intramolecular hydrogen bonding. Copyright © 2009 Society of Chemical Industry     

Zur Reaktion der N-Sulfinylamine mit Isocyaniden und die Synthese von 2,5-Diaryl-3,4-diarylimino-1,2,5-thiadiazolidin-S-oxiden

The Reaction of N-Sulfinylamines with Isocyanides and Synthesis of 2,5-Diaryl-3,4-diarylimino-1,2,5-thiadiazolidin-S-oxides N-Sulfinylamines 1 react with isocyanides 2 to give isocyanates 3 , isothiocyanates 6 , and especially 2,5-diaryl-3,4-diarylimino-1,2,5-thiadiazolidin-S-oxides 7 . This new heterocyclic ring system 7 can also be synthesized in high yields by a cyclization reaction of tetraarylated oxalic amidines 9 with thionyl chloride. The acid catalyzed hydrolysis of the heterocyclic compounds 7 leads to oxalic anilides 8 , the hydrolysis with alkali forms amidines 9 . The amidine 9a reacts with N-sulfinyl-p-toluenesulfonamide 11 to give an open chained adduct 12 .     

增产胺及其类似物的合成研究

本文报道一种经济简便的制备增产胺及其类似物的改进方法。３．４－二氯苯酚与１，２－二氯乙烷在ＫＯＨ溶液中、在相转移催化剂Ｂｕ＿４Ｂｒ存在下反应，得到１－氯－２－（３，４－二氯苯氧）乙烷２＿ｂ，产率９８％。２＿ｂ与二乙胺的丙酮溶液在封管中反应得到增产胺１．，产率９５％。使用相同的方法还制备了５个具有植物生长调节活性的类似物。     

导电聚合物单体3，4-乙烯二氧噻吩的合成

以硫代二甘酸为起始原料,经过五步反应得到产物3,4-乙烯二氧噻吩（EDOT）,过程如下：首先在浓硫酸催化条件下,硫代二甘酸与甲醇酯化生成硫代二甘酸二甲酯,产率为93．2％;产物进而与草酸二乙酯反应后得到3,4-二羟基噻吩-2,5-二甲酸二甲酯,产率为92．0％;然后经O-烷基化反应,反应中加入四丁基溴化铵作为相转移催化剂,得到3,4-乙烯二氧噻吩-2,5-二羧酸二甲酯,再经水解得到3,4-乙烯二氧噻吩-2,5-二甲酸;在DMSO为溶剂、氮气保护条件下,3,4-乙烯二氧噻吩-2,5-二甲酸在碱式碳酸铜催化作用下脱去两分子C02得到终产物EDOT。本方法中间产物及终产物的结构经由IR证实,并经过GC含量分析,总收率为34．6％。     

Reactions with β-ketodianilides. I. New synthesis of Pyrido[3,4-c]pyridine Derivatives

Acetonedicarboxylic acid dianiline reacted with malononitrile, ethyl cyanoacetate or benzoylacetonitrile to give (6-amino-5-cyano-1,2-dihydro-2-oxo-1-phenylpyrid-4-yl)-acetanilide ( 3 ), (3-cyano-2,6-dioxo-1-phenyl-1,2,5,6-tetrahydropyrid-4-yl)acetanilide ( 8 ) or (3-cyano-1,6-dihydro-1,2-diphenyl-6-oxopyrid-4-yl)acetanilide ( 9 ). Compounds 3 and 8 could be cyclised into 8-amino-1,6-diphenyl-1,2,4,5,6,7-hexahydro-7-iminopyrido[3,4-c]pyridine-2,5-dione ( 4 ) and 7-amino-1,2,3,5,6,8-hexahydro-1,6-diphenylpyrido[3,4-c]pyridine-2,5,8-trione ( 10 ) respectively by heating their solutions in dimethylformamide in the presence of triethylamine. Each of 3 and 4 coupled with arenediazonium chlorides to give the corresponding arylhydrazone derivatives ( 5a–d ) and ( 6a–c ), respectively. Condensation of 4 with p-nitrosodimethylaniline yielded 8-amino-4- (p-dimethylaminophenylimino)-1,6-diphenyl-1,2,4,5,6,7-hexahydro-7-iminopyrido[3,4-c]pyridine2,5-dione ( 7 ).     

Synthesis of 2,3-trans-3,4-cis- and 2,3-trans-3,4-trans-2,3,4-triphenyltetrahydrofurans

The synthesis of 2,3-trans-3,4-cis- and 2,3-trans-3,4-trans-2,3,4-triphenyltetrahydrofurans was undertaken because these compounds incorportae the essential structural features of certain 2,3-diphenyl-benzofurans and 1,2,3-triphenylalkanones reported earlier to have marked antifertility activity. The synthesis of the 2 tetrahydrofurans was achieved by the cyclization of corresponding 2,3,4-triphenylbutane-1,4-diols upon heating with dimethyl sulfoxide (DMSO). The butane 1,4-diols were in turn prepared either by direct litium aluminum hydride (LAH) reduction of methyl 3-benzoyl-2,3-diphenylpropionates or by conversion of these propionates to delta-3,4-butryrolactones followed by LAH reduction. The propionates were prepared from the Fiedel-Crafts reaction of 2,3-diphenylsuccinic anhydride with benzene. Tetrahydrofurans were tested for their antiimplantation activity in rats. 2,3-trans-3,4-cis-2,4-diphenyl-3-p -(beta-pyrrolidinoethoxy) phenyltetrahydrofuran oxalate was found to inhibit implantation completely at 50 mg/kg, but was inefective at a lower dose.