A Pd-Catalyzed Synthesis of Functionalized Piperidines
作者:Benjamin D. W. Allen、Matthew J. Connolly、Joseph P. A. Harrity
DOI:10.1002/chem.201602586
日期:2016.9.5
A readily available cyclic carbamate 1 functions as a general precursor to a range of functionalized piperidine products via a new Pd‐catalyzed annulation strategy. An asymmetric catalytic variant provides a rapid and efficient means to access these heterocycles with high to excellent levels of enantiocontrol. Finally, these richly functionalized compounds are amenable to further chemoselective elaboration
A Pd-Catalyzed [4 + 2] Annulation Approach to Fluorinated N-Heterocycles
作者:Víctor García-Vázquez、Larry Hoteite、Christopher P. Lakeland、David W. Watson、Joseph P. A. Harrity
DOI:10.1021/acs.orglett.1c00752
日期:2021.4.2
3-Fluoro- and trifluoromethylthio-piperidines represent important building blocks for discovery chemistry. We report a simple and efficient method to access analogs of these compounds that are armed with rich functionality allowing them to be chemoselectively derivatized with high diastereocontrol.
Catalytic Enantioselective α-Allylation of Deconjugated Butenolides with Aza-π-allylpalladium 1,4-Dipoles: Access to Optically Pure 2-Piperidones Bearing an All-Carbon Quaternary Stereocenter
4-diploes, in situ generated from palladium-mediated decarboxylation of cyclic carbamates and amide-substituted acyclic carbonates, has been successfully developed. An array of enantioenriched 2-piperidones bearing an all-carbon quaternary stereocenter were obtained in highyields with excellent enantioselectivities (up to 99% yield and 99% ee). The utility of this method was also showcased by a large-scale
Cooperative Chiral Lewis Base/Palladium‐Catalyzed Asymmetric Syntheses of Methylene‐Containing δ‐Lactams
作者:Paul Zebrowski、Uwe Monkowius、Mario Waser
DOI:10.1002/ejoc.202300982
日期:2023.12
An asymmetric protocol for the syntheses of novel δ-lactams by utilizing a synergistic chiral isothiourea/achiral Pd-catalyst combination for the α-allylation of activated aryl esters followed by deprotection/cyclization has been successfully established.