Rapid and Highly Efficient Synthesis of O,O ‐Dialkyl‐ N,N ‐dialkylphosphoramidates From O,O ‐Dialkylphosphite

ABSTRACT

Phosphoramidates constitute a fundamental class of organophosphorus compounds, defined by their distinctive phosphorus─nitrogen (P─N) bond and highly tunable chemical properties. These features fortify their broad utility across diverse domains, including medicinal chemistry, agrochemicals, and advanced materials. Notably, O,O ‐dialkyl‐ N,N ‐dialkylphosphoramidates are of particular significance in the context of Chemical Weapons Convention (CWC) verification, where they are classified under Schedule 2.B.06 as degradation products of the nerve agent Tabun (GA). To address the limitations associated with conventional synthetic routes—often reliant on toxic reagents and harsh reaction conditions—we report a rapid, efficient, and operationally simple one‐pot protocol for the synthesis of O,O ‐dialkyl‐ N,N ‐dialkylphosphoramidates via an iodine‐catalyzed Atherton–Todd reaction. This methodology utilizes inexpensive iodine (10 mol%) as an efficient catalyst in combination with cesium carbonate (Cs ₂ CO ₃ ) as a base, delivering excellent yields (88%–95%) within just 20 min at ambient temperature in a CCl ₄ /hexane (1:4, v/v) solvent system. This developed synthetic method eliminates specialized instrumentation and chromatographic purification, enhancing practicality and scalability. It is robust across 10 diverse derivatives and enables reliable preparation of reference standards for identifying CWC‐relevant compounds, particularly Tabun markers. Overall, it offers a cost‐effective, efficient, and operationally simple alternative for organophosphorus synthesis and CWC verification.