M. Campbell et Mj. Mcleish, IMPROVED SYNTHESIS OF A PRECURSOR TO 4-AMINO-4-DEOXYCHORISMIC ACID USING AN IMINOPHOSPHORANE AS A BASE-LABILE PROTECTING GROUP, Journal of chemical research. Synopses, (4), 1993, pp. 148-149
Reduction of ido-8-endo-bromo-6-oxabicyclo[3.2.1]oct-2-en-7-one (4) to
the corresponding iminophosphorane (7) leads to a much improved synth
esis of -4-amino-3-hydroxycyclohexa-1,5-diene-1-carboxylic acid.