HCID 178521919, compound → HCID 178431034, compound

Participants

Reaction Conditions

Reaction Steps

Following general procedure F using trans‐12a (67.8 mg, 0.25 mmol), B2pin2 (127 mg, 0.50 mmol), [Ir(COD)OMe]2 (2.5 mg, 0.00375 mmol) and 1a (3.8 mg, 0.0075 mmol) in THF (1.25 mL). Stirred in vial at 50 °C for 20 hours. Analysis of crude 1 H NMR using internal standard 1,2‐dimethoxyethane showed 11.2:3.9:1 meta:dimeta:para borylation (overall meta:para ratio of 15.1:1) in 91% yield (with 9% unreacted starting material). The crude product was purified by silica gel chromatography (10% EtOAc in Petroleum Ether 40‐60 o C) and the monoborylated products were partially separated from the dimeta product. Mono borylated products were isolated as colourless oil (52 mg) with 14:1 meta:para ratio (as determined by 1 H NMR). A small amount of B2Pin2 impurity was found to be inseparable from the final product on silica. Corrected yield ‐ 60 mg, 0.15 mmol, 60%.

Provenance & Evidence