Heteroaromatic N-oxide rearrangements. Reinvestigation of 1,3 tosyloxy migration in the reaction of isoquinoline N-oxide with tosyl chloride
作者:Bruce E. Maryanoff、Han-Cheng Zhang、Allen B. Reitz、Gregory C. Leo、William J. Jones
DOI:10.1016/s0040-4039(00)79299-9
日期:1993.11
IsoquinolineN-oxide (2) reacts with 18O-enriched tosyl chloride to furnish 18O-labeled 4-tosyloxy-isoquinoline (4), which was assessed for oxygen isotopic enrichment by NMR and mass spectrometry. The 30–45% 18O incorporation at the bridging oxygen is inconsistent with a high level of the intramolecular tight-ion-pair (“sliding”) mechanism. A combination of two intramolecular mechanisms is probably