J. Einhorn et al., DIANIONS OF N-PROTECTED IMINODIACETIC ACID DIESTERS - NEW SYNTHONS WITH BROAD SYNTHETIC POTENTIALITIES, Synlett, (12), 1994, pp. 1023-1024
Boc N-protected iminodiacetic acid diesters easily give dianionic spec
ies in the presence of two equivalents of lithium diisopropylamide (LD
A). Further addition of various electrophiles results in symmetrically
disubstituted compounds with modest to good yields. This method gives
a new access to nitrogen heterocycles when dielectrophiles are used.