Lithium Chloride → tert-butyl 5-(pyridin-4-yl)-3,4-dihydroisoquinoline-2(1H)-carboxylate

関与物質

反応条件

反応手順

(Tet. Lett, 1995, 36, 5247) To tert-butyl 5-bromo-3,4-dihydroisoquinoline-2(1H)-carboxylate (0.989 g, 3.17 mmol), 4-(tributylstannyl)pyridine (1.75 g, 4.75 mmol), LiCl (1.343 g, 31.7 mmol) in toluene (15 mL) was added dichlorobis(triphenylphosphine) palladium (II) (0.222 g, 0.317 mmol) and the reaction was heated to 110° C. After 72 h, the reaction was partitioned with 10% aq KF (20 mL) and EtOAc (50 mL). The aqueous layer was extracted with EtOAc (2×50 mL). The combined organic layers were washed with brine (15 mL) and dried (MgSO4). Purification by silica gel chromatography afforded 0.63 g of Intermediate 17A as clear oil (64%). 1H NMR (400 MHz, CDCl3) δ 8.66 (2 H, d, J=6.06 Hz), 7.23-7.33 (3 H, m), 7.17-7.21 (1 H, m), 7.13 (1 H, d, J=7.58 Hz), 4.65 (2 H, s), 3.55 (2 H, br. s), 2.72 (2 H, t, J=5.68 Hz), 1.50 (9 H, s) ppm.

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