Methanesulfonyl chloride → 1-Methanesulfonyl-4-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine

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Reaction Steps

To a cooled (0° C.) solution of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridinium chloride (8 g) and N-ethyldiisopropylamine (12 mL) in dichloromethane (100 mL) is added dropwise methanesulfonyl chloride (3 mL). The mixture is stirred for 12 hours at room temperature. The mixture is partitioned between dichloromethane and 0.1 M hydrochloric acid. The organic phase is separated, washed with brine and dried (MgSO4). The solvent is evaporated and the residue is crystallized from diethylether to give the title compound. Yield: 7.4 g; LC (method 15): tR=0.98 min; Mass spectrum (ESI+): m/z=288 [M+H]+.

Provenance & Evidence