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The preparation of the complex MoTp(NO)(DMAP)(4,5-η 2 -(2-trifluoromethyl)pyridine) (DMAP = 4-(dimethylamino)pyridine; Tp = tris(pyrazolyl)borate) is described. The CF 3 substituent is found to preclude κ-N coordination, allowing for direct coordination without protection of the nitrogen. The dihapto-coordinate complex can be isolated as a single diastereomer, methylated, and reacted with a range of nucleophiles. Oxidative decomplexation affords the free dihydropyridines in good yield (75-90%). As a demonstration of synthetic utility, a series of novel bridgehead CF 3 -substituted isoquinuclidines was prepared from these decomplexed dihydropyridines.

Molybdenum-Promoted Synthesis of Isoquinuclidines with Bridgehead CF3 Groups

Molybdenum-Promoted Synthesis of Isoquinuclidines with Bridgehead CF₃ Groups