反应详情

The known method by T. Inaba, A. G. Birchler, Y. Yamada, S. Sagawa, K. Yokata, K. Ando and I. Uchida, J. Org. Chem., 1998, 63, 7582 for the preparation of the enantiomer of the title compound was followed. (S)-1-Phenylethanamine (30.4 ml, 236 mmol) and 4,4-dimethyl-3,5,8-trioxabicyclo[5.1.0]octane (34 g, 236 mmol) were dissolved in iPrOH (16 ml) and heated under reflux for 16 h. The mixture was stirred and cooled in an ice bath. Hexanes (90 ml) was added. After 1 h the colourless crystalline solid was filtered off, washed with hexanes and dried to give (5S,6R)-2,2-dimethyl-6-((S)-1-phenylethylamino)-1,3-dioxepan-5-ol (21.9 g, 35%). The 1H NMR was in agreement with that described for the enantiomer of the title compound by T. Inaba, A. G. Birchler, Y. Yamada, S. Sagawa, K. Yokata, K. Ando and I. Uchida, J. Org. Chem., 1998, 63, 7582. [α]D 20 −96.6 (c, 1.01, MeOH). Lit. (T. Inaba, A. G. Birchler, Y. Yamada, S. Sagawa, K. Yokata, K. Ando and I. Uchida, J. Org. Chem., 1998, 63, 7582) [α]D 25 +96.2 (c 1.00, MeOH) for the enantiomer.

1. temperatureheated
2. temperatureunder reflux for 16 h
3. temperaturecooled in an ice bath
4. filtrationAfter 1 h the colourless crystalline solid was filtered off
5. washwashed with hexanes
6. customdried