Sodium Carbonate → (1R*,2S*)-5'-methoxy-2-(3-vinyl-1H-indazol-6-yl)spiro[cyclopropane-1,3'-indolin]-2'-one

Beteiligte Stoffe

Reaktionsschritte

To a mixture of (1R*,2S*)-2-(3-iodo-1H-indazol-6-yl)-5′-methoxyspiro [cyclopropane-1,3′-indolin]-2′-one (1.00 g, 2.32 mmol) and 4,4,5,5-tetramethyl-2-vinyl-1,3,2-dioxaborolane (500 mg, 3.25 mmol) in a 20 mL microwave vial was added PhCH3/EtOH (7 mL/3.5 mL), followed by 1 M Na2CO3 (3 mL, 3 mmol). After stirring for 1 min at rt, Ph(PPh3)4 (50 mg, 0.043 mmol, 1.9 mol %) was added and the resulting mixture was purged with argon, and microwaved 3 h at 120° C. This reaction was repeated twice on the same scale and the resulting mixtures were combined. Aqueous workup gave the crude title compound as a dark orange solid/foam (3.10 g) which was used without further purification. A sample of pure compound can be obtained by flash chromatography (Hex/EtOAc 1:1). 1H NMR (400 MHz, CDCl3) δ 7.89 (d, J=8.4 Hz, 1H), 7.45 (s, 1H), 7.01 (dd, J=18.2 Hz, J=11.4 Hz, 1H overlapping with d, J=6.8 Hz, 1H; total 2H), 6.83 (d, J=8.4 Hz, 1H), 6.61 (dd, J=8.4 Hz, J=2.4 Hz, 1H), 6.09 (d, J=18.0 Hz, 1H), 5.56 (d, J=1.6 Hz, 1H), 5.52 (d, J=11.6 Hz, 1H), 3.56 (t, J=7.6 Hz, 1H, partially overlapping with MeOH residue), 3.26 (s, 3H), 2.24 (dd, J=7.8 Hz, J=5.0 Hz, 1H), 2.18 (dd, J=9.2 Hz, J=4.8 Hz, 1H); MS ESI 332.0 [M+H]+, calcd for [C20H17N3O2+H]+ 332.1.

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