Synthesis of 3,6-Dihydro-2<i>H</i>-[1, 2]-Oxazines from Nitroarenes and Conjugated Dienes, Catalyzed by Palladium/Phenanthroline Complexes and Employing Phenyl Formate as a CO Surrogate
作者:Mohamed A. EL-Atawy、Dario Formenti、Francesco Ferretti、Fabio Ragaini
DOI:10.1002/cctc.201801223
日期:2018.10.23
Palladium/phenanthroline catalyzedreduction of nitroarenes by in situ‐generated carbon monoxide, from the decomposition of phenyl formate, affords the corresponding nitrosoarenes. The latter are trapped by conjugated dienes to give the corresponding 3,6‐dihydro‐2H‐[1, 2]‐oxazines (hetero Diels‐Alder adducts). Many functional groups are well tolerated. Yields are higher than those obtainable by any