Umpolung reactivity in amide and peptide synthesis
作者:Bo Shen、Dawn M. Makley、Jeffrey N. Johnston
DOI:10.1038/nature09125
日期:2010.6
which the polarities of the two reactants are reversed (German, umpolung) during carbon–nitrogen bond formation relative to traditional approaches. The use of nitroalkanes as acyl anion equivalents provides a conceptually innovative approach to amide and peptide synthesis, and one that might ultimately provide for efficient peptide synthesis that is fully reliant on enantioselective methods.
Electrooxidative coupling of salts of nitro compounds with halide, nitrite, cyanide, and phenylsulfinate anions
作者:A. I. Ilovaisky、V. M. Merkulova、Yu. N. Ogibin、G. I. Nikishin
DOI:10.1007/s11172-006-0007-7
日期:2005.7
salts of primary and secondary nitrocompounds (nitroethane, 1- and 2-nitropropanes, nitrocyclohexane, and nitrocycloheptane) in the presence of excess halide, nitrite, cyanide, and phenylsulfinate anions under undivided and divided amperostatic electrolysis conditions in a two-phase medium (CH2Cl2/H2O) produces geminal nitrohalides (35–85% yields), dinitro compounds (15–51%), nitronitriles (6–27%)
An efficient organocatalytic enantioselective synthesis of spironitrocyclopropanes
作者:Utpal Das、Yi-Ling Tsai、Wenwei Lin
DOI:10.1039/c2ob26943k
日期:——
An organocatalytic asymmetric synthesis of spironitrocyclopropanes has been demonstrated starting from 2-arylidene-1,3-indandiones and bromonitroalkanes catalyzed by a cinchona-derived bifunctional organocatalyst. The products were obtained with excellent enantioselectivities, diastereoselectivities and with good yields.
A New Preparation of Aliphatic Nitro Compounds by S<sub>H</sub>2′ Reactions of<i>gem</i>-Halo Nitro Compounds with Allyltributylstannane
作者:Noboru Ono、Klaus Zinsmeister、Aritsune Kaji
DOI:10.1246/bcsj.58.1069
日期:1985.3
α-Nitroalkyl radicals generated from gem-halo nitro compounds are reactive enough to undergo the carbon–carbon bond forming reaction with allyltributylstannane via radical chain processes, which provides a new method for the introduction of an allyl group into nitroalkanes.
Highly enantioselective conjugate addition of 1-bromonitroalkanes to α,β-unsaturated ketones catalyzed by 9-amino-9-deoxyepiquinine
作者:Li-ting Dong、Rui-jiong Lu、Quan-sheng Du、Jun-min Zhang、Sheng-ping Liu、Yi-ning Xuan、Ming Yan
DOI:10.1016/j.tet.2009.03.055
日期:2009.5
Asymmetric conjugate addition of 1-bromonitroalkanes to α,β-unsaturatedketones was studied using chiral primary amines as the catalysts. 9-Amino-9-deoxyepiquinine was found to be highly efficient catalyst for the transformation. 4-Bromo-4-nitroketones were obtained with excellent enantioselectivities (97–99% ee) and good yields (61–99%) for a variety of alkyl vinyl ketones. The product could be further