Gold-catalyzed annulations of allenes with N-hydroxyanilines to form indole derivatives with benzaldehyde as a promoter
作者:Rahul Kisan Kawade、Po-Han Huang、Somnath Narayan Karad、Rai-Shung Liu
DOI:10.1039/c3ob42131g
日期:——
Gold-catalyzed syntheses of 2,3-disubstituted indole derivatives from N-hydroxyanilines and allenes are described; these reactions require benzaldehyde as an additive to generate nitrones in situ. Our control experiments indicate that nitrones and water were indispensable in the reactions whereas N-hydroxyanilines alone were inactive nucleophiles. This synthetic method is compatible with allenes and
The first enantioselective aza-Henry reaction of non-activated cyclic iminoesters, derived from cyclic amino acids, has been developed. Good yields and enantioselectivities were observed for the reactionusing our original cinchonaalkaloid sulfonamide/zinc(II) catalyst. The transition state was proposed to explain the stereoselectivity based on experiments and DFT calculations.
已经开发了衍生自环状氨基酸的非活化环状亚氨基酯的第一个对映选择性氮杂-亨利反应。使用我们的原始金鸡纳生物碱磺酰胺/锌( II ) 催化剂的反应观察到良好的产率和对映选择性。基于实验和 DFT 计算,提出了过渡态来解释立体选择性。
One-Pot Asymmetric Nitro-Mannich/Hydroamination Cascades for the Synthesis of Pyrrolidine Derivatives: Combining Organocatalysis and Gold Catalysis
作者:David M. Barber、Andrej Ďuriš、Amber L. Thompson、Hitesh J. Sanganee、Darren J. Dixon
DOI:10.1021/cs401008v
日期:2014.2.7
The highly enantioselective preparation of trisubstituted pyrrolidinc derivatives employing a one-pot nitro-Mannich/hydroamination cascade is reported. This cascade approach utilizes an asymmetric bifunctional organo-catalytic nitro-Mannich reaction followed by a gold-catalyzed allene hydroamination reaction. The products are afforded in good yields and excellent diastereo- and enantioselectivities.
Diastereoselective synthesis of pyrrolidine derivatives via a one-pot nitro-Mannich/hydroamination cascade using base and gold catalysis
作者:Andrej Ďuriš、David M. Barber、Hitesh J. Sanganee、Darren J. Dixon
DOI:10.1039/c3cc40729b
日期:——
An efficient one-pot nitro-Mannich/hydroamination cascade reaction for the synthesis of substituted pyrrolidines bearing three stereocentres is reported. Proceeding under the control of a combination of base and gold(I) catalysts, the cascade reaction affords the pyrrolidine products in high yields with good to excellent diastereoselectivities.