A New Method for the Preparation of 3-Nitro-2-pyridinesulfenyl Chloride and One-Pot Syntheses of N(α)-tert-butoxycarbonyl-S-3-nitro-2-pyridinesulfenyl Derivatives of Cysteine and D-Penicillamine - Ueki, Masaaki; Honda, Maki; Kazama, Yuki; Katoh, Tsuyoshi (Synthesis, 1994)