The one-pot thermal reaction of 1,3-bis(o-acylamino phenyloxy)-2-methylene
propane derivatives gave either the bis(benzoxazole) derivatives or the ben
zodihydrofuran derivatives via tandem Claisen rearrangement in good yields.
The reaction courses strongly depend upon the reaction conditions such as
the solvent or the substituent of the carbamoyl moiety. The resulting bis(b
enzoxazole) derivative having a 2-aromatic substituent emits blue fluoresce
nce and has almost the same fluorescence quantum yield as the model mono(be
nzoxazole) compound. (C) 2000 Elsevier Science Ltd. All rights reserved.