Acetic Acid → (3S,4R)-1-(t-butyldimethylsilyl)3-[(R)-1-hydroxyethyl]-4-[2,2,2-tri(methylthio)ethyl]azetidin-2-one

참여 물질

반응 단계

K-Selectride ® (3.64 ml of 0.5M, 1.82 mmol) is added by syringe to a mixture of potassium iodide (126 mg., 0.758 mmol) and (3S,4R)-1-(t-butyl dimethylsilyl)-3-(1-oxoethyl)-4-[2,2,2-tri(methylthio)ethyl]azetidin-2-one (298 mg, 0758 mmol) in freshly distilled ethyl ether (8 ml) at room temperature. The resulting mixture is stirred at room temperature for 2.5 hours, then quenched by the addition of acetic acid (218 mg., 3.64 mmol). The resulting mixture is diluted with ethyl acetate (25 ml) and filtered through celite. Removal of solvents in vacuo gives an oil which is chromatographed on silica gel (ether:petroleum ether) to yield 252 mg of (3S, 4R)-1-(t-butyldimethylsilyl)-3-[(R)-1-hydroxyethyl]-4-[2,2,2-tri(methylthio)ethyl]azetidin-2-one. N.M.R. (R isomer, CDCl3 +D2O) δ4.15(dq,1), δ3.95(ddd,1,J=9.5,2.3), δ3.26(dd,1,J=8,2.3), δ 2.37(m,2), δ2.16(s,9), δ1.37(d,3,J=6,6), δ1.0(s,9), δ0.26(s,6).

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