Sodium Cyanide → 1'-(Diphenylmethyl)-2'-oxo-1,2'-dihydrospiro[1-benzofuran-3,3'-indole]-6-carbonitrile

Participants

Reaction Steps

A 10 mL microwave reaction vessel was charged with 6-bromo-1′-(diphenylmethyl)spiro[1-benzofuran-3,3′-indol]-2′(1′H)-one (0.51 g, 1.1 mmol), nickel chloride hexahydrate (0.25 g, 1.1 mmol), sodium cyanide (0.10 g, 2.1 mmol) and 1-methyl-2-pyrrolidinone (1 mL). The solution was irradiated at 200° C. for 20 min in a microwave reactor. The solution was allowed to cool to ambient temperature, diluted with ethyl acetate (25 mL) and filtered. The filtrate was washed with brine (3×15 mL), dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by column chromatography and eluted with a 15% to 50% gradient of ethyl acetate in hexanes to afford 1′-(diphenylmethyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-6-carbonitrile (0.50 g, 100%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ 7.44-7.22 (m, 10H), 7.21-7.18 (m, 1H), 7.14-6.93 (m, 5H), 6.72 (d, J=7.8 Hz, 1H), 6.55 (d, J=7.5 Hz, 1H), 5.07 (d, J=9.2 Hz, 1H), 4.80 (d, J=9.2 Hz, 1H).

Provenance & Evidence