Highly Enantioselective Iridium-Catalyzed Hydrogenation of 2-Benzylquinolines and 2-Functionalized and 2,3-Disubstituted Quinolines
作者:Da-Wei Wang、Xiao-Bing Wang、Duo-Sheng Wang、Sheng-Mei Lu、Yong-Gui Zhou、Yu-Xue Li
DOI:10.1021/jo900073z
日期:2009.4.3
The enantioselectivehydrogenation of 2-benzylquinolines and 2-functionalized and 2,3-disubstituted quinolines was developed by using the [Ir(COD)Cl]2/bisphosphine/I2 system with up to 96% ee. Moreover, mechanistic studies revealed the hydrogenation mechanism of quinoline involves a 1,4-hydride addition, isomerization, and 1,2-hydride addition, and the catalytic active species may be a Ir(III) complex
通过使用[Ir(COD)Cl] 2 /双膦/ I 2体系(ee高达96%)开发了2-苄基喹啉和2-官能化和2,3-二取代喹啉的对映选择性氢化。而且,机理研究表明,喹啉的氢化机理涉及1,4-氢化物的加成,异构化和1,2-氢化物的加成,并且催化活性物质可以是与氯化物和碘化物的Ir(III)络合物。
Intramolecular palladium-catalyzed aryl amination and aryl amidation
作者:John P. Wolfe、Roger A. Rennels、Stephen L. Buchwald
DOI:10.1016/0040-4020(96)00266-9
日期:1996.5
treatment with a palladium catalyst and a suitable base, aromatic halides undergo intramolecular substitution to form five, six, and seven-membered rings. In a similar fashion aryl halides with pendant amides or sulfonamides are cyclized to form five and six-membered rings.
The temperature required for flash pyrolytic elimination of water from -aminobenzyl alcohols and of carbon dioxide from dihydrobenzoxazinones to give azaxylylenes is considerably lowered by the presence of alumina and silica gel in the hot zone.
Synthesis of Benzo-Fused 1-Azabicyclo[<i>m</i>.<i>n</i>.0]alkanes via the Schmidt Reaction: A Formal Synthesis of Gephyrotoxin
作者:William H. Pearson、Wen-kui Fang
DOI:10.1021/jo0011383
日期:2000.10.1
variety of substrates. Fortunately, these materials were easilymade. Ultimately, the azido-alkene 81 bearing a 2-bromoethyl side-chain was useful for the Schmidt reaction, producing the known benzo-fused indolizidine 49, which had been transformed by Ito et al. into gephyrotoxin 4. The synthesis of 49 required nine steps (five purifications) from commercially available 4-methoxy-1-indanone 60 and proceeded
Total Synthesis of (−)-Martinellic Acid via Radical Addition−Cyclization−Elimination Reaction
作者:Atsushi Shirai、Okiko Miyata、Norimitsu Tohnai、Mikiji Miyata、David J. Procter、David Sucunza、Takeaki Naito
DOI:10.1021/jo800560p
日期:2008.6.1
The asymmetric total synthesis of martinellic acid, the first pyrrolo[3,2-c]quinoline alkaloid found in nature, is described. Three key steps in our synthesis of (−)-martinellic acid are the Bu3SnH-promoted radical addition−cyclization−elimination (RACE) reaction of an oxime ether with an α,β-unsaturated ester to generate the pyrrolo[3,2-c]quinoline core, a chemoselective lactam carbonyl reduction
描述了天然存在的第一种吡咯并[3,2- c ]喹啉生物碱马汀酸的不对称全合成。我们合成(-)-马来酸的三个关键步骤是肟醚与α,β-不饱和酯的Bu 3 SnH促进的自由基加成-环化-消除(RACE)反应,生成吡咯并[3,2 - c ^ ]喹啉核,化学选择性内酰胺羰基还原,和胍基化Mitsunobu反应条件下进行。还使用SmI 2研究了关键的自由基环化反应。(-)-Martinellic acid由市售的4-溴-3-甲基苯甲酸甲酯以比以前的合成更少的步骤合成,并且总产率得到了提高。