... Journal of the ... J. Am. Chem. Soc. ... a Reagents and conditions: (a) CAN (2.0 equiv), MeCN:H 2 O (1:1), 0 °C, 10 min; (b) CSA (0.125 equiv) or i-Pr 2 NEt (0.125 equiv), CH 2 Cl 2 , 25 °C, 1 h, 94% or 90% over two steps, respectively. Abbreviation: CSA, (±)-10-camphorsulfonic acid. ...