[Cl-].[Li+].C(OP([CH2:11][C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])(OCC)=O)C.O=[C:20]1[CH2:25][CH2:24][CH:23]([C:26]([O:28][CH2:29][CH3:30])=[O:27])[CH2:22][CH2:21]1>CC#N>[C:15]([O:14][C:12](=[O:13])[CH:11]=[C:20]1[CH2:25][CH2:24][CH:23]([C:26]([O:28][CH2:29][CH3:30])=[O:27])[CH2:22][CH2:21]1)([CH3:16])([CH3:17])[CH3:18]To a suspension of anhydrous lithium chloride (1.9 g, 45 mmol) in MeCN (100 ml) was added tert-butyl 2-(diethoxyphosphoryl)acetate (7.6 g, 30 mmol) at room temperature. The mixture was stirred for 30 min. TEA (6.4 ml, 45 mmol) was added and the mixture was stirred for another 30 min. Ethyl 4-oxocyclohexanecarboxylate (5.1 g, 30 mmol) was added and the mixture was stirred overnight. The precipitate was filtered off and the filtrate was concentrated to afford brown oil, which was purified by silica gel column (PE:EtOAc=10:1) to afford product (5 g, 62%).
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