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The efficient synthesis of isothiazolo[4,3-b]pyridines and isothiazolo[4,3-
b]quinolines via intramolecular vicarious nucleophilic substitution of hydr
ogen in N-oxides and quaternary salts of chloromethanesulfonamides derived
from 3-aminopyridine and 3-aminoquinoline is described. (C) 2001 Elsevier S
cience Ltd. All rights reserved.