据报道,使用由碘代苯和硝基乙酸甲酯原位生成的苯基碘鎓叶立德,对烯烃进行了高度对映选择性(高达 97.5% ee)和非对映选择性(95:5 dr 反式/顺式)Cu(I)催化的烯烃环丙烷化反应。环丙烷化反应对多种烯烃具有高对映选择性,反应在室温下进行。1-硝基环丙基酯是通用的结构单元,可分别通过两步和三步从市售产品中获得相应的环丙烷氨基酯和氨基环丙烷。
Nucleophilic Addition of Phenol Derivatives to Methyl 1-Nitrocyclopropanecarboxylates
作者:Olga Lifchits、Dino Alberico、Irina Zakharian、André B. Charette
DOI:10.1021/jo8010705
日期:2008.9.1
Nucleophilic ring opening of methyl 1-nitrocyclopropanecarboxylates by phenol derivatives in the presence of Cs2CO3 is described. The reaction tolerates a variety of substituents on both the aromatic alcohol and the cyclopropane and affords the products in good yields (53-84%) and with complete preservation of the enantiomeric excess at C-4. The methodology was applied in an enantioselective synthesis
描述了在Cs 2 CO 3存在下苯酚衍生物对1-硝基环丙烷甲酸甲酯的亲核开环。该反应耐受芳族醇和环丙烷上的多种取代基,并以良好的收率(53-84%)提供产物,并完全保留了C-4的对映体过量。该方法应用于去甲肾上腺素再摄取抑制剂阿莫西汀(Strattera)的对映选择性合成。
A Mild Procedure for the Lewis Acid-Catalyzed Ring-Opening of Activated Cyclopropanes with Amine Nucleophiles
作者:Olga Lifchits、André B. Charette
DOI:10.1021/ol8009286
日期:2008.7.3
The Lewis acid-catalyzed ring-opening of methyl 1-nitrocyclopropanecarboxylates with amine nucleophiles is described. The reaction proceeds at room temperature and with complete preservation of the enantiomeric purity from the electrophilic center of the cyclopropane to the acyclic product. The methodology was applied in an enantioselective synthesis of the dual serotonin/norepinephrine reuptake inhibitor (3R)-3-(1H-indol-1-yl)-N-methyl-3-phenylpropan-1-amine.