... Volume: Page: ... Achillion Pharmaceuticals, Inc., 300 George Street, New Haven, Connecticut 06511, United States. J. Med. ... c) 2 (0.9 equiv), N,N-diisopropylethylamine (5 equiv), DMSO, 120 °C, 3 h; (d) preparative HPLC to separate isomers, 20% for 9b(R,S) and ...