Water → (2R)-4-[2-(tert-butyldimethylsilanyloxy)-4-pyridin-3-yl-butoxy]benzeneboronic acid

Participants

Reaction Steps

A solution of n-butyllithium (2.5 M in hexanes, 6.9 ml, CAUTION) was added dropwise to a stirring solution of (2R)-1-(4-bromophenoxy)-4-(3-pyridyl)-2-(tert-butyldimethylsilyloxy)butane (1.50 g, Example 21b)) and triisopropyl borate (4.3 ml) in tetrahydrofuran (200 ml) at −70° C. After the addition was complete the reaction mixture was allowed to warm to room temperature. After 1 hour water (200 ml) and ethyl acetate (200 ml) were added. The organic phase was separated, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to give an oil. This was partly purified by column chromatography over silica eluting with dichloromethane then ethyl acetate then methanol to give the sub-title compound as a glass (2 g).

Provenance & Evidence