The preparation of several O-o- and O-p-nitrophenyloximes of 1-alkyl-4-piperidones, and their cyclisation to give 4a-alkoxy-1,2,3,4,4a,9b-hexahydrobenzofuro[3,2,-c]pyridines are described. The cyclisations of some simple 4-piperidone O-phenyloximes are also described, together with an unambiguous synthesis of one of the cyclisation products.
C. J. Cattanach and R. G. Rees, J. Chem. Soc. C, 1971, 53 DOI: 10.1039/J39710000053
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