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Liu, G. et al., J. Org. Chem., 64:1278 (1999). To a solution of S-(−)-t-butyl-sulfinamide (0.856 g, 7.06 mmol) in dichloromethane (14.13 mL) was added sequentially copper(II) sulfate (2.481 g, 15.54 mmol) and 4-chloropicolinaldehyde[1.0 g, 7.06 mmol, prepared according to a modified described by Negi etc, Synthesis, 991 (1996)]. The white suspension was stirred at rt. After 3 h, the brown suspension was filtered through CELITE®, eluting with DCM, to give a clear brown filtrate. Concentration gave a brown oil weighing 1.85 g. Purification by normal phase chromatography gave 1.31 g of 45A as a clear, yellow oil. MS (ESI) m/z: 245.0 (M+H)+.

1. customprepared
2. customa modified described by Negi etc, Synthesis, 991 (1996)]
3. filtrationthe brown suspension was filtered through CELITE®
4. washeluting with DCM
5. customto give a clear brown filtrate
6. concentrationConcentration
7. customgave a brown oil
8. customPurification by normal phase chromatography