AsymmetricPrinscyclization of in situ generated quinone methides and o-aminobenzaldehyde has been developed with chiral phosphoric acid as an efficient catalyst. This unconventional method provides a facile access to diverse functionalized trans-fused pyrano-/furo-tetrahydroquinoline derivatives in excellent yield and with excellent diastereo- and enantioselectivities (up to 99% yield and 99% ee)
Synthesis and Preliminary Biological Studies of 3-Substituted Indoles Accessed by a Palladium-Catalyzed Enantioselective Alkene Difunctionalization Reaction
作者:Tejas P. Pathak、Keith M. Gligorich、Bryan E. Welm、Matthew S. Sigman
DOI:10.1021/ja103472a
日期:2010.6.16
A unique alkene difunctionalization reaction that allows rapid construction of molecular complexity around the biologically relevant indole framework has been developed. The reaction proceeds with up to 87% yield, 99:1 er, and >20:1 dr. Evaluation of several of the compounds revealed promising anticancer activity against MCF-7 cells.
已经开发出一种独特的烯烃双官能化反应,可以在生物相关的吲哚框架周围快速构建分子复杂性。反应以高达 87% 的产率、99:1 er 和 >20:1 dr 进行。对几种化合物的评估揭示了对 MCF-7 细胞的有希望的抗癌活性。
Palladium-Catalyzed Enantioselective Addition of Two Distinct Nucleophiles across Alkenes Capable of Quinone Methide Formation
作者:Katrina H. Jensen、Tejas P. Pathak、Yang Zhang、Matthew S. Sigman
DOI:10.1021/ja909030c
日期:2009.12.2
A sequential intramolecular-intermolecular enantioselective alkene difunctionalization reaction has been developed which is thought to proceed through Pd-catalyzed quinonemethide formation. The synthesis of new chiral heterocyclic compounds with adjacent chiral centers is achieved in enantiomeric ratios up to 99:1 and diastereomeric ratios up to 10:1.
A hypervalent iodine mediated alkenedifunctionalization reaction of vinylphenols has been developed. The chemistry is applicable to a wide range of substitutions on both the alkene and nucleophile substrates, enabling the rapid synthesis of 3-substituted indoles and 2-substituted indolizines in good yields and high diastereoselectivities under metal-free conditions.