反应详情

t-Butyldimethylchlorosilane (940 mg, 6.25 mmol) is added in one portion to a solution of (3S,4R)-1-(t-butyldimethylsilyl)-3-[(R)-1-hydroxyethyl]-4-carbomethoxymethylazetidin-2-one (1.88 g, 6.25 mmol) and triethylamine (1.27 g, 6.25 mmol) in 15 ml of anhydrous diemthylformamide at 0° C. After 15 min. at 0° C. the cooling bath is removed and the reaction mixture is stirred at room temperature for 24 hrs. Ether (100 ml) is added and the mixture is filtered, then washed with 2.5 N hydrochloric acid (20 ml), water (3×20 ml) and brine. The organic phase is dried over magnesium sulfate, then concentrated in vacuo. The residue is chromatographed on silica gel (7:3 petroleum ether:ether) to yield (3S,4R)-1-(t-butyldimethylsilyl)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-4-carbomethoxymethylazetidin-2-one. n.m.r. (CDCl3) δ4.1 (m,2), δ3.68 (S,3), δ3.03 (dd,1,J= 4.3,2.7), δ2.8 (ABq,2), δ1.17 (d,3, J=6.6), δ0.98 (s,9), δ0.89 (s,9), δ0.23 (s,6), δ0.1 (s,6).

1. customAfter 15 min. at 0° C. the cooling bath is removed
2. additionEther (100 ml) is added
3. filtrationthe mixture is filtered
4. washwashed with 2.5 N hydrochloric acid (20 ml), water (3×20 ml) and brine
5. dry with materialThe organic phase is dried over magnesium sulfate
6. concentrationconcentrated in vacuo
7. customThe residue is chromatographed on silica gel (7:3 petroleum ether:ether)