2-(Bromomethyl)-5-(trifluoromethyl)furan → 6-fluoro-2'-oxo-1'-[(2R)-tetrahydrofuran-2-ylmethyl]-1',2'-dihydrospiro[1-benzofuran-3,3'-indole]-5-carbonitrile

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Reaction Steps

Following the procedure as described in EXAMPLE 9 and making non-critical variations using (R)-(tetrahydrofuran-2-yl)methyl 4-methylbenzenesulfonate to replace 2-(bromomethyl)-5-(trifluoromethyl)furan, and 6-fluoro-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carbonitrile to replace 3-methylspiro[furo[3,2-f][1,2]benzisoxazole-5,3′-indol]-2′(1′H)-one, 6-fluoro-2′-oxo-1′-[(2R)-tetrahydrofuran-2-ylmethyl]-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-5-carbonitrile was obtained (34%): 1H NMR (300 MHz, CDCl3) δ 7.37-7.27 (m, 1H), 7.12-7.06 (m, 3H), 7.01-6.92 (m, 1H), 6.79-6.74 (m, 1H), 4.94 (ABq, 2H), 4.31-4.21 (m, 1H), 3.91-3.72 (m, 4H), 2.12-1.84 (m, 4H); MS (ES+) m/z 364.9 (M+1).

Provenance & Evidence