反应详情

温度

75 °C

Adapting literature known protocols (Jordan, et al., Bioorg. Med. Chem., 2002, 10(8), 2625-2633; Abela Medici, et al, J. Chem. Soc., Perkin Trans. 1, 1997, (20), 2258-2263; Springer, et al., J. Med. Chem., 1990, 33(2), 677-681; and Larden and Cheung, Tetrahedron Lett., 1996, 37(42), 7581-7582), a solution of methanesulfonyl chloride (MsCl) (20.0 mmol) in anhydrous pyridine (about 10 mL) is drop-wise added with stirring and at a temperature of about 0° C. (ice bath) to a solution of the corresponding N,N-bis(2-hydroxyethyl) derivative (5 mmol) in anhydrous pyridine (about 10 mL). After about 30 minutes, the reaction mixture is heated at 50-100° C. for about 1-3 h. After cooling to room temperature, potential precipitates, if any, e.g., pyridinium methansulfonate, are filtered off before the solvents are partially removed under reduced pressure using a rotary evaporator. The remainder of the reaction, work-up, and product isolation are essentially conducted as described in Variant A.

1. temperatureAfter cooling to room temperature
2. filtrationpotential precipitates, if any, e.g., pyridinium methansulfonate, are filtered off before the solvents
3. customare partially removed under reduced pressure
4. customa rotary evaporator
5. customThe remainder of the reaction