Development of a Scaleable Route for the Production of cis-N-Benzyl-3-methylamino-4-methylpiperidine
2003
The synthesis of cis-N-benzyl-3-methylamino-4-methylpiperidine (5) via hydroboration of tetrahydropyridine 3 followed by oxidation and reductive amination was optimized and scaled up to produce 10-kg quantities of product. Three routes to 3 were identified, and the reduction of pyridinium salt 7 was selected as the most preferable to run on-scale. The hydroboration and oxidative workup were carefully studied to optimize throughput on that transformation, as was the reductive amination.
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