2-(4-Chloro-2-Methoxy-6-Methyl-Phenyl)-4,4,5,5-Tetramethyl-[1,3,2]Dioxaborolane

2-(4-Chloro-2-methoxy-6-methylphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane is an intermediate in the preparation of B-(4-Chloro-2-hydroxy-6-methylphenyl)boronic Acid , which can be useful in the preparation of orally bioavailable pyrrolodinopyrimidine-??containing inhibitors of heat shock protein 90 (Hsp90) as potential antitumor agents.