The synthesis of 3-diazo-2-nitromethylenepiperidine, in six steps from 2-pi
peridone, is reported. This is the first compound described which contains
the 3-diazo-1-nitropropene function. The title compound is stable enough to
be isolated and characterised in gram quantities using standard organic ch
emistry techniques and was used to prepare some 5-aza-spiro[2.5]octane and
4,5,6,7-tetrahydro-1H-pyrazolo-[4,3-b]pyridine derivatives. (C) 2001 Elsevi
er Science Ltd. All rights reserved.