A synthesis of the β-receptor blocker called toliprolol...

A synthesis of the $\beta$ -receptor blocker called toliprolol begins with a reaction between 3 -methylphenol and cpichlorohydrin. The synthesis is outlined below. Give the structures of the intermediates and of toliprolol.
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Key Concepts

?-Adrenergic Blockers Structural Characteristics

?-Adrenergic blockers typically share an aryloxypropanolamine skeleton, a structural motif that is essential for their activity at adrenergic receptors. Recognizing the functional groups, such as the aromatic ring, the ether bridge, and the amino alcohol moiety, is central to the design and synthesis of these therapeutic agents.

Epoxide Formation from Halohydrins

Halohydrins, which possess adjacent hydroxyl and halogen groups, can undergo a base?mediated intramolecular cyclization to form epoxides. This process is fundamental in organic synthesis because the resulting three-membered cyclic ethers are strained and highly reactive toward further chemical transformations.

Nucleophilic Ring Opening of Epoxides

Epoxides, due to their ring strain, are susceptible to attack by nucleophiles. The ring opening typically occurs at the less substituted carbon under basic or neutral conditions, allowing for the selective introduction of new functional groups. This mechanism is a pivotal step in building complex molecular architectures in synthesis.

Williamson Ether Synthesis

The Williamson Ether Synthesis is a widely used method for constructing ethers by reacting an alkoxide ion with an alkyl halide or a similar electrophile. When applied to phenols, deprotonation produces a phenoxide ion that can attack electrophilic centers to form the crucial aryl–oxygen linkage, which is often present in many biologically active molecules.

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