Pd(0)-Catalyzed Chemoselective Deacylative Alkylations (DaA) of <i>N</i>-Acyl 2-Oxindoles: Total Syntheses of Pyrrolidino[2,3-<i>b</i>]indoline Alkaloids, (±)-Deoxyeseroline, and (±)-Esermethole
作者:Nivesh Kumar、Vipin R. Gavit、Arindam Maity、Alakesh Bisai
DOI:10.1021/acs.joc.8b01101
日期:2018.9.21
We report an efficient Pd(0)-catalyzed deacylative allylation of N-acyl 3-substituted 2-oxindoles via the coupling of in situ generated nucleophiles (3 and 4) with allyl electrophiles for the synthesis of a variety of 2-oxindoles with C3-quaternary centers. Gratifyingly, this alkylation process is found to be highly chemoselective in nature, where a C–C bond formation is completely predominant over
Synergistic Ir/Cu Catalysis for Asymmetric Allylic Alkylation of Oxindoles: Enantio‐ and Diastereoselective Construction of Quaternary and Tertiary Stereocenters
quaternary and tertiary stereogenic centers are privileged structural motifs, which widely exist in pharmaceutical and natural products. Herein, a highly regio-, enantio-, and diastereoselectiveallylic alkylation of 3-alkyl oxindoles through synergistic iridium and copper catalysis is described, which provides a series of 3,3-disubstituted oxindole derivatives containing adjacent quaternary and tertiary
Oxidative cyanation of 2-oxindoles: formal total synthesis of (±)-gliocladin C
作者:Arindam Maity、Avishek Roy、Mrinal Kanti Das、Subhadip De、Malay Naskar、Alakesh Bisai
DOI:10.1039/c9ob02752a
日期:——
synthesize a wide variety of 3-cyano 3-alkyl/aryl 2-oxindoles sharing an all-carbon quaternary center under additive-free conditions. The application of this process is shown by the formal total synthesis of (±)-gliocladin C (11c) in a few steps.
Catalytic Enantioselective Dearomatization/Rearomatization of 2-Nitroindoles to Access 3-Indolyl-3′-Aryl-/Alkyloxindoles: Application in the Formal Synthesis of Cyclotryptamine Alkaloids
作者:Wei-Cheng Yuan、Xiao-Jian Zhou、Jian-Qiang Zhao、Yong-Zheng Chen、Yong You、Zhen-Hua Wang
DOI:10.1021/acs.orglett.0c02350
日期:2020.9.18
The first catalyticenantioselective dearomatization/rearomatization of 2-nitroindoles triggered by the Michael addition of 3-monosubstituted oxindoles was established. A wide range of 3-indolyl-3′-alkyloxindoles (up to 99% yield, 97% ee) and 3-indolyl-3′-aryloxindoles (up to 95% yield, 99% ee) were obtained by using an organocatalyst. This method provides an unprecedented strategy to access structurally