2-[4-(2,4-Difluorophenoxy)phenyl]-4,4,5,5-tetramethyl-1,3,2-dioxaborolane → HCID 69020799, compound

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Reaction Steps

Prepare the title compound in the manner analogous to the procedure set fourth in the final step of example E-227 using 4-cyano-5-ethyl-3-iodo-1-methyl-1H-pyrrole-2-carboxylic acid ethyl ester (prepared in preparation 38) and 2-[4-(2,4-difluoro-phenoxy)-phenyl]-4,4,5,5-tetramethyl-[1,3,2]-dioxaborolane. Purify the material by silica gel chromatography (Chromatotron™) eluting with hexane/ethyl acetate 4:1 to provide the final title compound, 4-cyano-5-ethyl-3-[4-(2,4-difluoro-phenoxy)-phenyl]-1-methyl-1H-pyrole-2-carboxylic acid ethyl ester, as a tan solid. Mass spectrum (m/e): 411.1 (M*+1): (Bruker 300) 1H NMR (CDCl3) δ 7.27-7.31 (2H, d), 7.07-7.14 (1H, m), 6.74-6.97 (4H, m), 4.04-4.11 (2H, dd), 3.84-3.88 (3H, s), 2.78-2.89 (2H, dd), 1.23-1.34 (3H, t), 1.00-1.06 (3H, t).

Provenance & Evidence