Kj. Duffy et G. Tennant, THE SCOPE AND MECHANISM OF A NOVEL SYNTHESIS OF 3,4-FUSED ISOXAZOLES, Journal of the Chemical Society, Chemical Communications, (23), 1995, pp. 2457-2459
Thermal cyclisation of 2-nitrophenyl- and 3-nitrohetaryl-ethanoate der
ivatives in xylene is facilitated indirectly by 5 Angstrom molecular s
ieves affording an efficient general method for the construction of sy
nthetically useful 3,4-fused isoxazoles; evidence for the mechanism of
these novel heterocyclisation reactions is presented.