[CH2:1]([C@H:8]([CH2:12][CH:13]=[CH2:14])[C:9](O)=[O:10])[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH3:7].Cl.[CH3:16][NH:17][CH3:18].C(P(=O)(OCC)OCC)#N.C(N(CC)CC)C>CN(C=O)C.CCOC(C)=O>[CH3:16][N:17]([CH3:18])[C:9](=[O:10])[C@H:8]([CH2:1][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH3:7])[CH2:12][CH:13]=[CH2:14]To a mixture of 5.00 g (0.025 mol) of the product of Example 5 and 2.27 g (0.028 mol) of dimethylamine hydrochloride in DMF at 0° C. was added 4.21 mL (0.028 mol) of diethyl cyanophosphonate followed by 7.38 mL (0.053 mol) of triethylamine. The reaction mixture was stirred at 0 degrees for 1 h and then at room temperature for 3 h. The resulting pale yellow suspension was diluted with 750 mL of EtOAc/Hex (2:1) and this solution was then washed with 5% aqueous HCl solution, water, saturated sodium bicarbonate and brine. The organic layer was dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was chromatographed on silica gel eluting with ethyl acetate/hexanes (1:4) to provide 5.68 g (100%) of the title compound as a colorless oil. CI Mass Spec: 226.3 (M+H).
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