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
An Expedient and Practical Method for the Synthesis of a Diverse Series of Cyclopropane α-Amino Acids and Amines
作者:Ryan P. Wurz、André B. Charette
DOI:10.1021/jo035596y
日期:2004.2.1
described. Nitrocyclopropane carboxylates can be readily prepared through treatment of α-nitroesters and iodobenzene diacetate or α-nitro-α-diazoesters with a Rh(II) catalyst and an olefin. Reduction of the nitro group using zinc/HCl in i-PrOH affords substituted cyclopropane α-amino esters in modest to high yields (54−99%). A “one-pot” procedure involving sequential cyclopropanation and reduction is described