The diester has a 1,3-diCO relationship and could be disconnected but we have in mind using
malonate so we would rather disconnect the alternative 3-amino carbonyl compound (the
Me2N group has:1,3一relationship with both ester groups) by a 1,3-diX disconnection giving an
unsaturated ester. This a,p-unsaturated ester disconnects nicely to a heterocyclic aldehyde and
diethyl nalonate,
`