An organocatalytic asymmetric sulfenylation of 3-aryloxindoles with N-(sulfanyl)succinimides has been developed by using commercially available (DHQD)2PHAL as catalyst. Various chiral 3-benzylthio-, alkylthio-, and arylthio-substituted oxindoles, containing 3,3-disubstituted quarternary carbon stereocenters, could be obtained in high enantioselectivities (85–97% ee). Furthermore, the opposite enantiomers
proline was designed and synthesized as a bifunctional organocatalyst for the “on-water” asymmetric Michael addition of less-hydrophobic oxoindoles to nitroolefins. Employing only 1 mol% of this bifunctional organocatalyst demonstrated exceptional catalytic efficiency (>90 % yield in most cases) and stereoselectivity in reactions involving various 3-substituted oxoindoles (up to > 99 % de and 96 % ee) and
设计并合成了由脯氨酸衍生的二氯苯基取代的手性脲,作为双功能有机催化剂,用于疏水性较低的氧代吲哚与硝基烯烃的“水上”不对称迈克尔加成。仅使用 1 mol% 的这种双功能有机催化剂,在涉及各种 3-取代氧代吲哚(高达 > 99% de 和 96% ee)和硝基烯烃(高达 > 99% de 和 98% ee)。