1,4-Dioxaspiro[4.5]dec-7-en-8-yl trifluoromethanesulfonate → 8-(5-Isopropoxy-2-methyl-4-nitrophenyl)-1,4-dioxaspiro[4.5]dec-7-ene

Participants

Reaction Conditions

Reaction Steps

A stirred solution of the 1,4-dioxaspiro[4.5]dec-7-en-8-yl trifluoromethanesulfonate (0.03 mmol) and 2-(5-isopropoxy-2-methyl-4-nitrophenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (Intermediate 5, 0.04 mmol) in THF (3 mL), containing [Pd(PPh3)4] (0.013 mmol) and K3PO4.H2O (0.045 mmol), is heated to 80° C. under argon for 16 hours. After workup and silica flash chromatography (hexane/EtOAc 4:1), 8-(5-isopropoxy-2-methyl-4-nitrophenyl)-1,4-dioxaspiro[4.5]dec-7-ene is obtained. 1H NMR (CDCl3, 400 MHz) δ 7.62 (s, 1H), 6.82 (s, 1H), 5.74 (m, 1H), 4.65 (m, 1H), 4.04 (m. 4H), 2.47 (m, 4H), 2.27 (s, 3H), 1.89 (t, 2H), 1.29 (d. 6H). MS (ES+): 334.16 (M+1)+.

Provenance & Evidence