C(O[CH2:9][C:10]1[C:11]([O:24]C)=[N:12][CH:13]=[CH:14][C:15]=1[C:16]([OH:23])([CH2:21][CH3:22])[CH2:17][C:18]([OH:20])=[O:19])C1C=CC=CC=1.C([O-])=O.[NH4+].C1(N=C=NC2CCCCC2)CCCCC1.[I-].[Na+].C[Si](Cl)(C)C>CO.C1COCC1.[Pd].O.C(#N)C>[CH2:21]([C:16]1([OH:23])[C:15]2[CH:14]=[CH:13][NH:12][C:11](=[O:24])[C:10]=2[CH2:9][O:19][C:18](=[O:20])[CH2:17]1)[CH3:22](−)-3-(3-benzyloxymethyl-2-methoxy-4-pyridyl)-3-hydroxy-pentanoic acid (13.5 g; 39 mmol; Stage 80.b) is put in solution in 87 ml of methanol. This solution is poured under nitrogen onto 10% Palladium on damp carbon at 50% (27.7 g; 13 mmol). The reaction medium is agitated for 5 minutes, then it is poured into a solution of ammonium formate (11.5 g; 183 mmol) in 135 ml of methanol. The reaction medium is agitated for 30 minutes while allowing the temperature to rise, then it is heated at 40° C. for 30 minutes. The medium is then filtered on a bed of Clarcel followed by concentrating. 40 ml of toluene is poured in which is evaporated off; this operation is repeated in order to eliminate the methanol. The residue thus obtained is taken up in 45 ml of THF. Then a solution of dicyclohexylcarbodiimide (7.180 g; 34.5 mmol) in 20 ml of THF is then poured in. The reaction medium is heated to 50° C. for 1 hour. The mixture is taken to 20° C. then the dicyclohexylurea is filtered. The filtrate is concentrated to dryness. The residue is put in solution in 46 ml of acetonitrile, 6.0 g (40.5 mmol.) of sodium iodide then 5.13 ml (40.5 mmol) of trimethylsilyl chloride are added. The reaction medium is maintained under agitation at ambient temperatue for 5 hours. Then 28 ml of acetonitrile and 5.6 ml of water are added. The precipitate obtained is filtered then taken up in 1 ml of water, and the pH is adjusted to 7.5 by the addition of a solution of ammonium hydroxide. The solid obtained is filtered and dried. M=4.2 g of final product is obtained with a yield of 34% and a (+) enantiomer/(−) enantiomer proportion of 88.4/11.6.
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