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To a solution of 1.06 g of sodium hydroxide in 14 ml of water were added 2.82 ml of allylthiol. The solution was stirred under an argon atmosphere for 10 minutes. To this solution was added, over a period of 1 minute, a solution of 3.79 g of ethyl acetoxyazetidinone in 6 ml of water. After about 15 minutes, when the starting material had been consumed, the solution was extracted three times with dichloromethane. The combined organic extracts were back-extracted with water, then dried over magnesium sulphate, evaporated in vacuo, and chromatographed over silica gel, eluting with ethyl acetate/hexane mixtures. The main product (2.84 g) was trans 4-allylthio-3-ethylazetidinone, which contained a trace amount of the cis isomer. (Yield 2.84 g)

1. additionTo this solution was added, over a period of 1 minute
2. waitAfter about 15 minutes
3. customwhen the starting material had been consumed
4. extractionthe solution was extracted three times with dichloromethane
5. extractionThe combined organic extracts were back-extracted with water
6. dry with materialdried over magnesium sulphate
7. customevaporated in vacuo
8. customchromatographed over silica gel
9. washeluting with ethyl acetate/hexane mixtures