4-Chloro-7H-pyrrolo[2,3-d]pyrimidine in Tofacitinib Intermediates: A Key Compound in Modern API Synthesis

Sep 11, 2025 · 2 min read · In the ever-evolving world of pharmaceutical research and drug development, the importance of high-quality intermediates cannot be overstated. One such critical compound is 4-Chloro-7H-pyrrolo[2,3-d]pyrimidine, an essential intermediate in the synthe...