Hypervalent Iodine(III) Reagents as Safe Alternatives to α-Nitro-α-diazocarbonyls
作者:Ryan P. Wurz、André B. Charette
DOI:10.1021/ol034672g
日期:2003.6.1
A cyclopropanation reaction involving iodonium ylides generated in situ allows for efficient preparation of substituted 1-nitro-1-carbonyl cyclopropanes. This robust cyclopropanation reaction can be performed in organic solvents, biphasic aqueous media, or under solvent-free conditions with alkene substrates. The iodonium ylides generated in situ display some surprising differences in reactivity when
Catalytic asymmetric synthesis of nitrocyclopropane carboxylates
作者:Benoît Moreau、Dino Alberico、Vincent N.G. Lindsay、André B. Charette
DOI:10.1016/j.tet.2011.05.113
日期:2012.4
A Cu(I)-catalyzed asymmetric cyclopropanation of alkenes with an iodonium ylide has been developed. The copper source, hypervalent iodine source, solvent, and additives all have a significant effect on the yields and enantioselectivities. High enantioselectivity (up to 99:1 er) and diastereoselectivity (95:5 dr trans/cis) were achieved for a wide range of alkenes. Conditions were developed to convert
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。