[CH3:1][O:2][CH2:3][C:4]([CH2:9][O:10][CH3:11])([CH3:8])[C:5]([OH:7])=O.CCN(C(C)C)C(C)C.C1C=CC2N(O)N=NC=2C=1.[CH2:31]([O:33][CH:34]([O:38][CH2:39][CH3:40])[CH2:35][CH2:36][NH2:37])[CH3:32]>C(Cl)Cl.C1COCC1.C(Cl)CCl>[CH2:31]([O:33][CH:34]([O:38][CH2:39][CH3:40])[CH2:35][CH2:36][NH:37][C:5](=[O:7])[C:4]([CH2:3][O:2][CH3:1])([CH3:8])[CH2:9][O:10][CH3:11])[CH3:32]5 g of 3-methoxy-2-methoxymethyl-2-methyl-propionic acid (prepared as described in EP609058) were dissolved in 49 mL of DCM and 12 mL of THF. 11.4 mL of DIPEA, 5.84 g of HOBt, 7.07 g of EDC and 5.45 g of 3,3-diethoxy-propylamine were added sequentially. The mixture was stirred for 23 h at rt, diluted with DCM and washed with sat. NaHCO3. The organic phase was dried over anh. Na2SO4 and concentrated in vacuo. The resulting crude material was purified by CC using Hept/EtOAc from 3/1 to 0/1 as eluant to yield 7.25 g of N-(3,3-diethoxy-propyl)-3-methoxy-2-methoxymethyl-2-methyl-propionamide as a yellowish oil.
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