PROBLEM 25.58 - Organic Chemistry

Question

Question: Identify the intermediates (A–C) in the following reaction sequence, which was used to prepare racemic ofloxacin. One enantiomer of the product, levofloxacin, is an antibiotic used to treat severe bacterial infections that have not responded to other drugs.

Step-by-Step Solution

Answer

Answer

Intermediates A, B, and C in the given reaction

Addition-elimination reaction

It is the addition reaction followed by elimination. The overall product looks like the product of a substitution reaction. 

Catalytic hydrogenation

The reduction using the basic element hydrogen in the presence of a catalyst is known as catalytic hydrogenation.

This reduction reaction reduces the multiple bonds of the alkene or alkyne chain and the functional groups present in the compound. 

Products of the given reaction

The addition-elimination reaction forms the intermediate A; Intermediate B is a substitution product. Intermediate C is the reduction product. 

These intermediates are shown hereunder:

Intermediates A, B, and C in the given reaction