A highly efficient strategy for the kinetic resolution of Michael adducts was realized using a chiral N‐heterocyclic carbene catalyst. The kinetic resolution provides a new convenient route to single diastereomers of cyclohexenes and Michael adducts in good yields with high enantiomeric excesses (up to 99 % ee with a selectivity factor of up to 458). This “two flies with one swat” concept allows the
Michael Addition of Active Methylene Compounds to α,β-Unsaturated Carbonyl Compounds under the Influence of Molecular Sieves in Dimethyl Sulfoxide
作者:Tomoko Kakinuma、Ryoichi Chiba、Takeshi Oriyama
DOI:10.1246/cl.2008.1204
日期:2008.12.5
The Michael addition of active methylene compounds to α,β-unsaturated carbonyl compounds in the presence of MS 4A in dimethyl sulfoxide proceeds smoothly to afford the corresponding 1,4-addition pr...
Stereoselective reductive radical cyclization of ketonitriles catalyzed by Cp2TiCl2 in the presence of chlorosilane and zinc
作者:Longhu Zhou、Toshikazu Hirao
DOI:10.1016/s0040-4020(01)00645-7
日期:2001.8
Reductive radical cyclization of ketonitriles was catalyzed by Cp2TiCl2 in the presence of Me3SiCl, zinc powder and imidazole, giving the 2-amino-3-cyano-2-cyclopenten-1-ols in moderate to good yields with high trans selectivity (up to 94% trans). The influence of the catalyst, chlorosilane, co-reductant, solvent, and temperature on both the yield and diastereoselectivity of the cyclized products was
Reaction of 3-Amino-4,6-diarylthieno[2,3-b]pyridine-2-carboxamides with Ninhydrin
作者:V. V. Dotsenko、V. S. Muraviev、D. Yu. Lukina、V. D. Strelkov、N. A. Aksenov、I. V. Aksenova、G. D. Krapivin、L. V. Dyadyuchenko
DOI:10.1134/s1070363220060043
日期:2020.6
The reaction ofN-substituted amides of 3-amino-4,6-diarylthieno[2,3-b]pyridine-2-carboxylic acids with ninhydrin in the presence of catalytic amounts of sulfuric acid gave 1 '-spiro[indene-2,2 '-pyrido[3 ',2 ':4,5]thieno[3,2-d]pyrimidine]-1,3,4 '(3 ' H)-triones. Structure of a number of key compounds was studied using 2D NMR spectroscopy; the bioavailability parameters of the obtained compoundsin silicowere calculated. In a laboratory experiment, a moderate antidote effect was revealed with respect to the 2,4-D herbicide for one compound.
Promonenkov, V. K.; Shestopalov, A. M.; Sharanin, Yu. A., Journal of Organic Chemistry USSR (English Translation), 1985, vol. 21, # 9, p. 1797 - 1802
作者:Promonenkov, V. K.、Shestopalov, A. M.、Sharanin, Yu. A.、Litvinov, V. P.、Rodinovskaya, L. A.、et al.