4-(Trimethylsilyl)phenylboronic Acid (contains varying amounts of Anhydride) → 1-(4-Trimethylsilanyl-phenyl)-isoquinoline

Participants

Reaction Steps

15.0 g (0.07727 mol) of 4-trimethylsilyl-phenylboronic acid, 10.11 g (0.0618 mol) 1-chloro-isoquinoline, 15.11 g (0.0464 mol) of cesium carbonate, 0.71 g (0.000775 mol) of tris(dibenzylideneacetone) dipalladium (0), 0.43 g (0.00185 mol) of di-tert-butyl-trimethylsilylmethyl-phosphane and 100 ml of dioxane were stirred at room temperature for 12 hr. The reaction mixture was filtered and the solvent was removed under vacuum. The resulting mixture was purified by chromatography on silica gel using petroleum ether/ethyl ether (10/0.5) as eluent. Yield of 1-(4-trimethylsilanyl-phenyl)-isoquinoline was 10.63 g (62%) as a colorless solid with m.p. 93.45° C. 1H NMR (CDCl3) 0.30 (s, 9H, Me3Si), 7.45-7.70 (m, 7H, arom-H), 7.85 (s, 1H, arom-H), 8.15 (s, 1H, arom-H), 8.51 (s, 1H, arom-H). Anal. Found: C, 77.68; H, 6.95; N, 4.97.

Provenance & Evidence