1357391-10-6Relevant articles and documents
Cinchona alkaloid-derived thiourea-catalyzed diastereo- and enantioselective [3+2] cycloaddition reaction of isocyanoacetates to isatins: A facile access to optically active spirooxindole oxazolines
Zhao, Mei-Xin,Zhou, Hao,Tang, Wen-Hao,Qu, Wei-Song,Shi, Min
, p. 1277 - 1283 (2013)
An efficient diastereo- and enantioselective [3+2] cycloaddition reaction of α-aryl isocyanoacetates to isatins catalyzed by a quinine-derived bifunctional amine-thiourea-bearing sulfonamide as multiple hydrogen-bonding donor catalyst has been investigated. The corresponding adducts, which bear a spirocyclic quaternary stereocenter at the C-3 position of the oxindole, were obtained in good yields (51-95%), high diastereoselectivities (up to >20:1 dr) and good to excellent enantioselectivities (up to 97% ee). Copyright