Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 71, Issue 19, Pages 7133-7145Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jo060285j
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A multistep scalable synthesis of the clinically important hepatitis C virus (HCV) protease inhibitor BILN 2061 (1) is described. The synthesis is highly convergent and consists of two amide bond formations, one etherification, and one ring-closing metathesis (RCM) step, using readily available building blocks 2-5. The optimization of each step is described at length. The main focus of the paper is the study of the RCM step and the description of the main problems faced when scaling up to pilot scale this highly powerful but very challenging synthetic operation. Eventually, the RCM reaction was smoothly scaled up to produce > 400 kg of cyclized product.
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