Construction of bispirooxindoles containing three quaternary stereocentres in a cascade using a single multifunctional organocatalyst
作者:Bin Tan、Nuno R. Candeias、Carlos F. Barbas
DOI:10.1038/nchem.1039
日期:2011.6
Single-step constructions of molecules with multiple quaternary carbon stereocentres are rare. The spirooxindole structural motif is common to a range of bioactive compounds; however, asymmetric synthesis of this motif is complicated due to the presence of multiple chiral centres. The development of organocatalytic cascade reactions has proven to be valuable for the construction of several chiral centres
Koz'minykh; Berezina; Koz'minykh, Russian Journal of General Chemistry, 1996, vol. 66, # 7, p. 1100 - 1105
作者:Koz'minykh、Berezina、Koz'minykh
DOI:——
日期:——
Cinchona-based squaramide-catalysed cascade aza-Michael–Michael addition: enantioselective construction of functionalized spirooxindole tetrahydroquinolines
作者:Wen Yang、Da-Ming Du
DOI:10.1039/c3cc44930k
日期:——
An efficient enantioselective cascadeaza-Michael-Michael addition reaction catalysed by a chiral bifunctional tertiary amine-squaramide catalyst has been developed. This cascadereaction proceeded well under mild conditions, furnishing highly functionalized spirooxindole tetrahydroquinolines with three contiguous stereocenters in excellent yields with excellent diastereoselectivities (>25:1 dr) and
Catalyst-free Synthesis of Spiro[indoline-3,1′-pyrazolo[5,1-a]isoquinolines]<i>via</i>Diastereoselective 1,3-dipolar Cycloaddition under Mild Conditions
A highly efficient catalyst‐free1,3‐dipolar cycloaddition reaction of methyleneindolinones and C,N‐cyclic azomethine imines was realized. The reactions afforded a large variety of spirooxindoles in high yields (up to 99%) and excellent diastereoselectivities (dr > 20:1). Furthermore, the configuration of one of the products was determined on the basis of X‐ray structural analysis. Accordingly, a possible