Novel Phthalimidine Synthesis. Mannich Condensation of o-Phthalaldehyde with Primary Amines using 1,2,3-1H-Benzotriazole and 2-Mercaptoethanol as Dual Synthetic Auxiliaries - Takahashi, Ichiro; Kawakami, Teruki; Hirano, Etsushi; Yokota, Hiroshi; Kitajima, Hidehiko (Synlett, 1996)