反应详情

The synthesis of 1 is illustrated in FIG. 8. Benzyl alcohol is coupled with 2-chloropyridine using a modification of a reported procedure to afford 2-benzyloxypyridine, compound 5, in high yield. A range of alkylating agents and solvents was investigated in search of preferred conditions for the irreversible covalent activation of 5. The preferred protocol is to add methyl triflate (bp 94-99° C.) to an ice-cold solution of compound 5 in toluene and allow the mixture to warm to ambient temperature. A white microcrystalline solid, compound 1, forms within minutes, as the solution warms. Analytically pure compound 1 (mp 82-86° C.) can be isolated by filtration or by evaporation of the supernatant under reduced pressure. Salt 1 is remarkably stable. It may be preferably stored under an argon atmosphere either in a refrigerator or on the laboratory bench-top at room temperature and the white crystals of compound 1 are routinely handled open to the air. No differences have been observed between freshly prepared crystals and those that were prepared three months prior.

1. customThe synthesis of 1