Primary-tertiary diamine-catalyzed Michael addition of ketones to isatylidenemalononitrile derivatives
作者:Akshay Kumar、Swapandeep Singh Chimni
DOI:10.3762/bjoc.10.91
日期:——
Simple primary-tertiary diamines easily derived from natural primary aminoacids were used to catalyze the Michael addition of ketones with isatylidenemalononitrile derivatives. Diamine 1a in combination with D-CSA as an additive provided Michael adducts in high yield (up to 94%) and excellent enantioselectivity (up to 99%). The catalyst 1a was successfully used to catalyze the three-component version
Ionic Liquid Mediated Green Synthesis of Spirooxindoles from <i>N</i>
-methyl Quinolones and Their Anti Bacterial Activity
作者:Raja S. Bhupathi、Bandi Madhu、Ch. Venkata Ramana Reddy、B. Rama Devi、P.K. Dubey
DOI:10.1002/jhet.2821
日期:2017.7
quinoline‐2,4(1H,3H)‐dione 1, isatins 2(a–e), and malononitrile/cyanoacetic ester 3(a–b) in the task‐specific ionicliquid [DBU][Ac] (1,8‐diazabicyclo[5.4.0]‐undec‐7‐en‐8‐ium acetate) leading to the spirooxindole derivatives 4(a–j) is described. This approach is affords the products in high yields without use of column chromatography and resulting compounds were evaluated for antibacterial activity against both
Organocatalytic Enantioselective 1,3-Dipolar Cycloadditions between Seyferth–Gilbert Reagent and Isatylidene Malononitriles: Synthesis of Chiral Spiro-phosphonylpyrazoline-oxindoles
作者:Taiping Du、Fei Du、Yanqiang Ning、Yungui Peng
DOI:10.1021/acs.orglett.5b00311
日期:2015.3.6
A new method has been developed for the catalytic enantioselective 1,3-dipolar cycloaddition of the Seyferth–Gilbert reagent (SGR) to isatylidene malononitriles using a cinchonaalkaloidderivative as a catalyst. This method allowed for the synthesis of a series of chiral spiro-phosphonylpyrazoline-oxindoles in good yields with excellent enantioselectivities. The synthetic utility of this method was
The active complexes of chiral N,N′‐dioxide ligands with dysprosium and magnesium salts catalyze the hetero‐Diels–Alderreaction between 2‐aza‐3‐silyloxy‐butadienes and alkylidene oxindoles to selectively form 3,3′‐ and 3,4′‐piperidinoyl spirooxindoles, respectively, in very high yields and with excellent enantioselectivities. The exo‐selective asymmetric cycloaddition successfully regaled the construction
Asymmetric organocatalytic conjugate addition of dialkyl phosphites to N-unprotected isatylidene malononitriles: access to 3-phospho-2-oxindoles with chiral quaternary stereocenters
作者:Zhao-Min Liu、Nai-Kai Li、Xiao-Fei Huang、Bing Wu、Ning Li、Chun-Yuen Kwok、Yong Wang、Xing-Wang Wang
DOI:10.1016/j.tet.2014.02.023
日期:2014.4
established for the first time by using a simple bifunctional tertiary amine–thioureacatalyst. The corresponding adducts, 3-phospho-2-oxindoles, containing a chiral quaternary carbon center at the 3-position of the oxindole, were obtained in good to excellent yields (up to 98%) with moderate to excellent enantioselectivities (up to 95% ee). In addition, optically active 3,3′-disubstituted oxindoles bearing carboxylate