We have developed a method for ring contraction of N–H piperidines using oxidativerearrangement with PhI(OAc)2. The reaction forms iminium ion intermediates that are effectively trapped by nucleophiles (e.g., NaBH4, H2O) yielding the corresponding pyrrolidine derivatives. Additionally, we propose an ionic mechanism supported by experiments and density‐functional theory calculations.
ZEZZA, CH. A.;SMITH, M. B.;ROSS, B. A.;ARHIN, AKWASI;CRONIN, P. L. E., J. ORG. CHEM., 1984, 49, N 23, 4397-4399
作者:ZEZZA, CH. A.、SMITH, M. B.、ROSS, B. A.、ARHIN, AKWASI、CRONIN, P. L. E.
DOI:——
日期:——
A Copper-Catalyzed Aerobic [1,3]-Nitrogen Shift through Nitrogen-Radical 4-<i>exo</i>
-trig Cyclization
作者:Yan Li、Rui Wang、Tao Wang、Xiu-Fen Cheng、Xin Zhou、Fan Fei、Xi-Sheng Wang
DOI:10.1002/anie.201709894
日期:2017.11.27
shift catalyzed by copper diacetate under an oxygen atmosphere (1 atm) has been developed for the construction of a diverse range of indole derivatives from α,α‐disubstituted benzylamine. In this reaction, oxygen was used as a clean terminal oxidant, and water was produced as the only by‐product. Five inert bonds were cleaved, and two C−N bonds and one C−C double bond were constructed in one pot during