C([N:4]1[CH2:7][CH2:6][C:5]1=[O:8])C=C.[Si:9](Cl)([C:12]([CH3:15])([CH3:14])[CH3:13])([CH3:11])[CH3:10].C(N([CH2:22][CH3:23])CC)C.[CH2:24](OC(=O)C)C.O>CN(C)C=O>[CH2:24]([CH:7]1[N:4]([Si:9]([C:12]([CH3:15])([CH3:14])[CH3:13])([CH3:11])[CH3:10])[C:5](=[O:8])[CH2:6]1)[CH:22]=[CH2:23]Allylazetidinone (0.22 g) was dissolved in dry N,N-dimethylformamide (5 ml) containing t-butyldimethylsilyl chloride (0.33 g). The solution was cooled to 0° and was treated with triethylamine (0.22 g) in N,N-dimethylformamide (1 ml) over a period of 15 minutes. After a further 15 minutes the solution was poured into ethylacetate/water. The organic phase was separated, washed with dil HCl, brine, dried (Na2SO4), evaporated, and chromatographed on silica gel 60 (230 mesh) eluting with ethylacetate. This gave 4-allyl-1-t-butyldimethylsilylazetidin-2-one (0.39 g).
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