4-[2-Hydroxy-3-(2-methylbenzothiazol-5-yloxy)propyl]-piperazine-1-carboxylic acid tert-butyl ester → (2R)-1-(2-methylbenzothiazol-5-yloxy)-3-piperazinylpropan-2-ol

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반응 단계

A solution of 4-[2-hydroxy-3-(2-methylbenzothiazol-5-yloxy)propyl]-piperazine-1-carboxylic acid tert-butyl ester (2.9 g, 7.1 mmol), a compound of formula (5), was dissolved in a 4N solution of HCl in dioxane (20 ml) and allowed to stir at room temperature for 4 hours. The solvent was evaporated under reduced pressure to yield a white solid. The white solid was dried under high vacuum, and then dissolved in methanol (250 ml). AG 1-X8 resin was added and the mixture shaken. Additional resin was added until a neutral pH was obtained. The resin beads were removed by filtration, and methanol removed from the filtrate under reduced pressure, and the residue placed under high vacuum overnight, to yield (2R)-3-(2-methylbenzothiazol-5-yloxy)-1-piperazinylpropan-2-ol as an oil.

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