Novel Methodology for the Efficient Synthesis of 3-Aryloxindoles: [1,2]-Phospha-Brook Rearrangement–Palladium-Catalyzed Cross-Coupling Sequence
作者:Masahiro Terada、Azusa Kondoh、Akira Takei
DOI:10.1055/s-0035-1561859
日期:——
A novelmethodology for the efficient synthesis of 3-aryloxindoles from isatin derivatives was developed. The methodology involves the formation of an oxindole having a phosphate moiety at the C-3 position via the [1,2]-phospha-Brook rearrangement under Bronsted base catalysis followed by palladium-catalyzed cross-coupling with aryl boron reagents. The one-pot synthesis of 3-aryloxindoles from isatin
Highly enantioselective phase-transfer alkylation of 3-substituted-2-oxindoles with activated bromomethanes is disclosed with a broad substrate scope by using bicyclic guanidinium as a catalyst and a Lewis acid as the co-catalyst. The alkylation adducts are versatile intermediates to accomplish the syntheses of pyrroloindolines and furoindolines.
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)。