[C:1]([O:5][CH2:6][CH3:7])(=[O:4])[CH2:2][OH:3].C(N(CC)CC)C.[CH3:15][C:16]([Si:19](Cl)([C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=1)[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1)([CH3:18])[CH3:17]>CN(C1C=CN=CC=1)C.C(Cl)Cl>[Si:19]([O:3][CH2:2][C:1]([O:5][CH2:6][CH3:7])=[O:4])([C:16]([CH3:18])([CH3:17])[CH3:15])([C:26]1[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1)[C:20]1[CH:25]=[CH:24][CH:23]=[CH:22][CH:21]=1To a 500ml round-bottom flask equipped with a magnetic stir-bar, N2inlet was added ethyl glycolate (10g, 96.0mmoles, 1eq) and dry CH2Cl2(200ml, 0.5M). This was followed by the addition of triethylamine (40ml, 0.288moles, 3eq) and DMAP (1.17g, 9.6mmoles, 10mol %) followed by the dropwise addition of TBDPSCl (27.5ml, 0.106moles, 1.1eq) in dry CH2Cl2(20ml). The reaction mixture was allowed to stir at room temperature overnight at which time the reaction mixture was diluted with CH2Cl2and washed with 1N HCl, saturated sodium bicarbonate, H2O and dried over Na2SO4. After filtration the volatiles were removed in vacuo to yield 30g (91%) of titled compound.
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