N(C(OC(C)C)=O)=NC(OC(C)C)=O.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH2:34]([C@@H:41]([CH2:45]O)[C:42]([OH:44])=[O:43])[C:35]1[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=1.[C:47]([OH:50])(=[S:49])[CH3:48]>O1CCCC1>[C:47]([S:49][CH2:45][C@H:41]([CH2:34][C:35]1[CH:36]=[CH:37][CH:38]=[CH:39][CH:40]=1)[C:42]([OH:44])=[O:43])(=[O:50])[CH3:48]2.44 g (12.05 mmol) of diisopropyl azodicarboxylate are added dropwise, at 0° C., to a solution of 3.16 g (12.05 mmol) of triphenylphosphine in 30 ml of tetrahydrofuran. Once the addition is complete, the mixture is stirred for 30 minutes at this temperature. The reaction medium is cooled to -10° C. and a solution of 1.45 g (8.05 mmol) of (S)-2-benzyl-3-hydroxypropionic acid (X S) and 0.92 g (12.05 mmol) of thioacetic acid in 10 ml of tetrahydrofuran is added dropwise. Once the addition is complete, the mixture is stirred for one hour at -10° C. and for a further two hours at room temperature.
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