Conjugate Addition of Nitroalkanes to an Acrylate Equivalent. Stereocontrol at C-α of the Nitro Group through Double Catalytic Activation
作者:Jesús M. García、Miguel A. Maestro、Mikel Oiarbide、José M. Odriozola、Jesús Razkin、Claudio Palomo
DOI:10.1021/ol901351k
日期:2009.9.3
selective direct conjugateaddition of prochiral nitroalkanes (R ≠ H) to acrylate equivalents is described. The method employs a unique Lewisacid/Brønsted base/MS ternary catalytic system and affords products with dr up to 97/3. With β-substituted (R′ ≠ H) acceptors unprecedented levels of anti/syn selectivity (≥96/4) are attained. Adducts can be transformed into enantioenriched γ-amino acids and derivatives
A cyanoethylation of 2-acetyl-5-R-furans, 1-nitro-2(5-R-2-furyl)ethanes, and 2-nitro-1-(2-furyl)propane was investigated. The optimum conditions were determined for preparation of monocyanoethylated products: nitriles of 5-oxo-5-(5-R-2-furyl)pentanoic and 4-nitro-5-(5-R-2-furyl)pentanoic acids. The cyanoethylation of furyl-containing nitroethanes with excess acrylonitrile provided bisadducts, dinitriles of 4-nitro-4-(5-R-furfuryl)heptanedionic acids.
Facile synthesis of nitriles from primary nitro compounds via nitrolic acids and their esters
作者:Rae Kyu Chang、Kyongtae Kim
DOI:10.1016/0040-4039(96)01779-0
日期:1996.10
The reactions of alkane- and arylalkanenitrolic acids esters with Bu3SnH in the presence of a catalytic amount of AIBN in refluxing benzene afforded the corresponding nitriles in excellent yields.