反应详情

To a solution of 5-[((2S)oxiran-2-yl)methoxy]-2-methylbenzothiazole, a compound of formula (3) (6.2 g, 28 mmol), and tert-butyl 1-piperazinecarboxylate, a compound of formula (4) (5.7 g, 31 mmol), in methylene chloride (200 ml), was added ytterbium (111) trifluoromethanesulfonate (1.73 g, 28 mmol). The resulting solution was allowed to stir at room temperature overnight. The solvent was evaporated (in vacuo), to yield a semi-solid, which was chromatographed on silica gel, eluting with 5% methanol/methylene chloride, to yield (2S)-1-(2-methylbenzothiazol-5-yloxy)butan-2-ol, tert butyl piperazinecarboxylate as a clear oil (9.5 g, 23 mmol).

1. customThe solvent was evaporated (in vacuo)
2. customto yield a semi-solid, which
3. customwas chromatographed on silica gel
4. washeluting with 5% methanol/methylene chloride