Tandem Long Distance Chain-Walking/Cyclization via RuH<sub>2</sub>(CO)(PPh<sub>3</sub>)<sub>3</sub>/Brønsted Acid Catalysis: Entry to Aromatic Oxazaheterocycles
作者:Rodrigo Bernárdez、Jaime Suárez、Martín Fañanás-Mastral、Jesús A. Varela、Carlos Saá
DOI:10.1021/acs.orglett.5b03499
日期:2016.2.19
A novel route to 1,3-oxazaheterocycles based on cooperative Ru–H/Brønsted acid catalysis is reported. The use of the commercially available RuH2(CO)(PPh3)3 complex allows for an efficient long distance chain-walking process while the Brønsted acid is responsible for generation of an electrophilic iminium ion which is trapped intramolecularly by an alcohol moiety. The alcohol, besides its nucleophilic