反应详情

A mixture of the product from step (c) (24.9 g), 250 ml methanol and 106 ml 1N sodium hydroxide was warmed to reflux for 10 minutes then 1N hydrochloric acid (53 ml) was added followed by 2-butyl-2-ethylaziridine (7.7 g, Synthetic Example 1(f)). After one hour the reaction was diluted with ethyl acetate and washed with 1N sodium hydroxide and then water. The organic layer was dried, filtered and concentrated. The residue was chromatographed on silica gel eluting with ethyl acetate-ethanol (3:1) to give a tan viscous oil (15.32 g). 1H NMR is consistent with proposed structure.

1. temperaturewas warmed
2. temperatureto reflux for 10 minutes
3. washwashed with 1N sodium hydroxide
4. customThe organic layer was dried
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was chromatographed on silica gel eluting with ethyl acetate-ethanol (3:1)