C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.N(C(OCC)=O)=NC(OCC)=O.[C:32]([O:36][C:37]([N:39]1[CH2:43][CH2:42][CH2:41][C@H:40]1[CH2:44][OH:45])=[O:38])([CH3:35])([CH3:34])[CH3:33].[CH3:46][C:47]1[N:52]=[CH:51][C:50](O)=[CH:49][CH:48]=1>C1COCC1>[CH3:46][C:47]1[N:52]=[CH:51][C:50]([O:45][CH2:44][C@@H:40]2[CH2:41][CH2:42][CH2:43][N:39]2[C:37]([O:36][C:32]([CH3:35])([CH3:34])[CH3:33])=[O:38])=[CH:49][CH:48]=1To a solution of triphenylphosphine (3.83 g, 14.60 mmol) in 40 mL of anhydrous THF at 0° C. was added diethyl azodicarboxylate (2.3 mL, 14.60 mmol) dropwise. The mixture was stirred at 0° C. for 30 minutes, then brought to room temperature. (S)-1-t-Butoxycarbonyl-2-pyrrolidinemethanol (1.96 g, 9.75 mmol, Aldrich Chemical Co.) and 6-methyl-3-pyridinol (Aldrich Chemical Co., 1.60 g, 14.60 mmol) were added to the reaction vessel, and the mixture was stirred for 16 hours. Solvent was removed in vacuo, and the residue was diluted with hexane and sonicated for 30 minutes. The resulting precipitate was filtered and washed with hexane. The hexane was removed in vacuo. The residue was purified by silica gel flash chromatography using a gradient from 100% hexane to a 1:1 solution of ethyl acetatelh exane (100%Hex, 10% EtOAc/Hex, 20%EtOAc/Hex, 1:1EtOAc/Hex) to give 1.61 g (57% ) of the title compound as a pale yellow oil. TLC Rf=0.42 (1:1 EtOAc/Hex). MS (DCI/NH3) m/e: 293 (M+H)+.
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