Abstract
Calcium dibutyryladenosine cyclophosphate is a widely used cardiovascular drug. The traditional batch synthesis process suffers from long reaction times, tedious operations, and unstable yields. Herein, a sequential continuous flow synthesis combined with a multistage in-line purification process of calcium dibutyryladenosine cyclophosphate was developed. The acylation reaction was completed in a continuous coil reactor at 160 °C in 20 min. And the high toxic solvent pyridine was replaced by acetonitrile. Furthermore, the multistage in-line purification process was integrated into the homemade 3D circular cyclone-type micromixer chip. Combining with the membrane phase separators, the residence time of the purification step was 30 s. The isolated yield of this sequential continuous process was 92% with 99% purity.
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