Affiliation: | 1. School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS (UK), Fax: (+44)?117‐929‐8611;2. AstraZeneca PR&D, Silk Road, Macclesfield, Cheshire, SK10 2NA (UK);3. AstraZeneca, Global Process R&D, Severn Road, Hallen, Bristol, BS10 7ZE (UK);4. Department of Chemistry, Caudill and Kenan Laboratories, UNC‐Chapel Hill, NC 27599‐3290 (USA) |