General and versatile synthesis of highly recyclable chiral phosphoric acid organocatalysts

The development of recyclable catalysts has gained more attention in recent years in order to minimize the environmental effect and the overall cost of catalytic processes. Some of the most broadly used chiral organocatalysts are BINOL-derived chiral phosphoric acids, making it necessary to develop efficient recycling strategies. While literature reports require up to 13 synthetic steps to access recyclable chiral phosphoric acids, here we report a general and concise 9-step approach to anthracene decorated heterogeneous chiral phosphoric acids (PS-Anth), which have shown high performance either in batch or continuous flow without observing catalyst degradation. We report a general and concise 9-step approach to heterogeneous chiral phosphoric acids and their application as highly recyclable organocatalysts in batch and continuous flow.