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Pregabalin is a chiral γ-aminobutyric acid analogue, and its synthesis under the principles of green chemistry focuses on step economy, safer reagents, high atom efficiency, and minimal waste generation. One widely discussed and environmentally improved route begins with readily available and less hazardous starting materials and emphasizes asymmetric synthesis to avoid wasteful resolution steps. The process generally starts with the preparation of a substituted alkene or nitrile intermediate derived from simple carbon sources such as isobutyl-containing aldehydes or acids, which are converted under mild conditions using recyclable catalysts. In a green synthetic approach, an initial Knoevenagel-type condensation or alkylation is carried out using benign solvents such as ethanol or water instead of chlorinated solvents. This step forms a carbon–carbon bond efficiently, improving atom economy. The resulting ________ ____ ________ __________ ____ ____ ____ _________.
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