Aerobic intramolecular aminothiocyanation of unactivatedalkenes has been developed by in situ generated iodine thiocyanate under open-flask conditions. This protocol provides a concise and efficient method for synthesizing SCN-containing pyrrolidine, piperidine and indoline derivatives with isolated yields of up to 87%. Furthermore, mixing iodine and sodium thiocyanate with oxygen afforded iodine
aziridine to copper. ESI-MS analysis provided evidence of involvement of reactive Cu(II) intermediates in the catalytic cycle. Overall, our results indicate that the reaction proceeds at the hypervalent iodine moiety of Togni reagent, which is activated by Cu(II) species acting as a Lewis acid catalyst. On the basis of these mechanistic considerations, we developed an efficient synthesis of trifluoromethylated
Intramolecular Insertion of Alkenes into Pd−N Bonds. Effects of Substrate and Ligand Structure on the Reactivity of (P−P)Pd(Ar)[N(Ar<sup>1</sup>)(CH<sub>2</sub>)<sub>3</sub>CR═CHR′] Complexes
作者:Joshua D. Neukom、Nicholas S. Perch、John P. Wolfe
DOI:10.1021/om200008t
日期:2011.3.14
thyl] complexes 4 via syn insertion of the pendant alkene into the Pd−N bond. Complexes 4 then undergo C−C bond-forming reductive elimination to yield N-aryl-2-benzylpyrrolidine derivatives 2. Kinetic studies indicate the rates of conversion of 3 to 4 and 4 to 2 are within 1 order of magnitude. The effects of phosphine ligand structure, alkene substitution, and the electronic properties of the Ar and