The present paper describes a silica-supported, perchloric-acid-catalyzed, efficient protocol for the synthesis of 2-(phenyl)oxazolo[4,5-b]pyridine derivatives. This strategy has high conversion, simple workup procedures, ambient conditions, short reaction times, and a reusable catalyst. Structures of the synthesized compounds have been established on the basis of elemental analysis and spectral data (IR, H-1 NMR, C-13 NMR, and mass spectrometry). Moreover, to investigate the mechanistic details of the reaction and to ascertain the regioselective outcome of the product, local nucleophilicity descriptors N-k at B3LYP/6-311G++(d, p) level were determined and analyzed.
CLARK R. L.; PESSOLANO A. A.; WITZEL B.; LANZA T.; SHEN T. Y.; ARMAN C. G+, J. MED. CHEM., 1978, 21, NO 11, 1158-1162
作者:CLARK R. L.、 PESSOLANO A. A.、 WITZEL B.、 LANZA T.、 SHEN T. Y.、 ARMAN C. G+