(a)
Interpretation: The structure of proline has to be drawn:
Concept Introduction:
Enamine formation:
Example for the formation of enamine is shown here:
In enamines, the lone pair of nitrogen will be in resonance with the adjacent
Retro synthetic analysis:
It is the analysis of the synthetic starting materials for a given compound through its precursors or fragments which are known as synthons. The synthons can be obtained by logical cleavage of the
Retro analysis for enamine formation:
The retro analysis of enamine reveals that the starting material of an enamine will be a secondary amine and a carbonyl compound.
Example:
(b)
Interpretation: The plausible mechanism for the reaction between compounds 1 and 2 has to be drawn.
Concept Introduction:
Enamine formation:
Aldehyde or ketone reacts with a secondary amine and forms enamine in mildly acidic conditions.
Example for the formation of enamine is shown here:
In enamines, the lone pair of nitrogen will be in resonance with the adjacent
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