How is 2-{2-[2-(2-Azidoethoxy)ethoxy]ethoxy}-1-[(4-methylphenyl)sulfonyl]ethanol (CAS: 168640-82-2) typically synthesized?

2-{2-[2-(2-Azidoethoxy)ethoxy]ethoxy}-1-[(4-methylphenyl)sulfonyl]ethanol is typically synthesized using a multi-step process involving the protection of the hydroxyl groups, followed by the introduction of the azido group, and then the coupling with the sulfonyl chloride. This synthesis often requires the use of protecting agents and careful control of reaction conditions to achieve high yield and selectivity. Common catalysts include Lewis acids and base-mediated reactions.