An Efficient Synthesis of (1R,4S)-1-Methyl-8-methoxy-3-(4-toluenesulfonyl)-2,3,4,5-tetrahydro-1,4-methano-3-benzazepine. A Formal Synthesis of (-)-Aphanorphine - Hu, Hanwei; Zhai, Hongbin (Synlett, 2003)