Remote Construction of N‐Heterocycles via 1,4‐Palladium Shift‐Mediated Double C−H Activation
摘要:
AbstractIn the past years, Pd0‐catalyzed C(sp3)−H activation provided efficient and step‐economical methods to synthesize carbo‐ and heterocycles via direct C(sp2)−C(sp3) bond formation. We report herein that a 1,4‐Pd shift allows access to N‐heterocycles which are difficult to build via a direct reaction. It is shown thato‐bromo‐N‐methylanilines undergo a 1,4‐Pd shift at theN‐methyl group, followed by intramolecular trapping by C(sp2)−H or C(sp3)−H activation at another nitrogen substituent and remote C−C bond formation to generate biologically relevant isoindolines and β‐lactams. The product selectivity is influenced by the employed ligand, with NHCs favoring the product of remote C−C coupling against products arising from direct C−C coupling and N‐demethylation.
Pernot; Willemart, Bulletin de la Societe Chimique de France, 1953, p. 324
作者:Pernot、Willemart
DOI:——
日期:——
Schiff bases as external and internal electrophiles in reactions of functionalized organolithium reagents. A new route to isoindoline derivatives and 1,2,3,4-tetrahydroisoquinolines
作者:Charles K. Bradsher、David A. Hunt
DOI:10.1021/jo00315a021
日期:1981.1
BRADSHER C. K.; HUNT D. A., J. ORG. CHEM., 1981, 46, NO 2, 327-330