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 practical method to access amino-isocoumarins catalyzed by a Rh(III) complex through redox-neutral C–H/O–H annulation has been disclosed. The use of N-functionalized cyclic carbonates is crucial to facilitate the catalytic turnover, and a broad spectrum of amino-isocoumarin derivatives were prepared with satisfactory yields. Amino-isocoumarin estrone conjugated with a selenocyano functionality was