You start with a suitable starting material, often a ketone or aldehyde, and react it with an amine to form an imine. In this case, you would want to generate an imine that can be used for the subsequent remote dianion addition.
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1,3-Dioxolan-4-one, 5-(2-hydroxyethyl)-2,2-dimethyl-, (5S)-
tetra-tert-butyl 1,1'-(1-benzoyl-4-oxopiperidine-3,5-diyl)di(hydrazine-1,2-dicarboxylate)
Di-tert-Butyl azodicarboxylate
Cyclohexanone
(2R,5R)-2-Hydroxymethyl-5-phenyl-tetrahydro-pyran-3-ol
5-Benzyl-4-isopropylidene-2,2-dimethyl-3,4-dihydro-2H-pyrrole
