Chiral synthesis via organoboranes. 6. Hydroboration. 74. Asymmetric hydroboration of representative heterocyclic olefins with diisopinocampheylborane. Synthesis of heterocyclic boronates and heterocyclic alcohols of very high enantiomeric purity
作者:Herbert C. Brown、J. V. N. Vara. Prasad
DOI:10.1021/ja00268a053
日期:1986.4
Etude de la borhydratation de dihydrofurannes, -thiophenes, -pyrannes et -thiopyrannes et de pyrrolines et tetrahydropyridines: obtention des heterocycles perhydrogenes correspondants hydroxyles et diethoxyboryles en 3; reactions de ces derniers avec la diethanolamine et obtention d'amine-boranes internes derives d'heteryl-2 perhydro dioxazaborocines-1,3,6,2
Etude de la borhydratation de dihydrofuranes, -thiophenes, -pyrannes et -thiopyranes et de pyrrolines et de tetrahydropyridines: obtention des杂环全氢对应物羟基和二乙氧基硼烯 3; 反应 de ces de derniers avec la diethanolamine et obtention d'amine-boranes internes 衍生 d'heteryl-2 perhydro dioxazaborocines-1,3,6,2
Chemo- and Stereodivergent Preparation of Terminal Epoxides and Bromohydrins through One-Pot Biocatalysed Reactions: Access to Enantiopure Five- and Six-Membered N-Heterocycles
作者:Fabricio R. Bisogno、Aníbal Cuetos、Alejandro A. Orden、Marcela Kurina-Sanz、Iván Lavandera、Vicente Gotor
DOI:10.1002/adsc.201000353
日期:——
Different enantiopureterminalepoxides or bromohydrins have chemoselectively been synthesised in one‐pot starting from the corresponding α‐bromo ketones through alcohol dehydrogenase (ADH)‐catalysed processes adding an organic co‐solvent and tuning appropriately the medium pH and the temperature. Thus, at neutral pH enantiopurebromohydrins were obtained while using basic conditions (pH 9.5–10) epoxides
Enantioenriched N-(2-chloroalkyl)-3-acetoxypiperidines as potential cholinotoxic agents. Synthesis and preliminary evidence for spirocyclic aziridinium formation
作者:Nam Huh、Charles M. Thompson
DOI:10.1016/0040-4020(95)00285-g
日期:1995.5
The syntheses of six enantioenriched analogs representing cyclic forms of acetylcholine are reported. (S)- and (R)-N-(2-chloroethyl)-3-acetoxypiperidine and (R,R)-, (R,S)-, (S,R)-, and (S,S)-N-(2-chloropropyl)-3-acetoxypiperidine have been synthesized from (R)- or (S)-3-hydroxypiperidine in five steps. (R)- and (S)-3-hydroxypiperidine were accessed via parallel stereospecific routes from d- and 1-glutamic
报道了代表乙酰胆碱的环状形式的六个对映体富集的类似物的合成。(S)-和(R)-N-(2-氯乙基)-3-乙酰氧基哌啶和(R,R)-,(R,S)-,(S,R)-和(S,S)-N从(R)-或(S)-3-羟基哌啶经五步合成了-(2-氯丙基)-3-乙酰氧基哌啶。(R)-和(S)-3-羟基哌啶可通过平行的立体定向途径从d-和1-谷氨酸进入,并通过非对映异构的tartranilic酸盐的分级重结晶而获得。((S)-N-(2-氯乙基)-3-乙酰氧基哌啶与高氯酸银反应形成乙酰胆碱的螺环叠氮基类似物,这是由叠氮基亚甲基的特征性1 H NMR位移所证明的。
Piperazine- and piperidine-derivatives as melanocortin receptor agonists
申请人:——
公开号:US20040082590A1
公开(公告)日:2004-04-29
The present invention relates to melanocortin receptor agonists of formula I, which is useful in the treatment of obesity, diabetes and male and/or female sexual dysfunction.
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