2-(Bromomethyl)tetrahydro-2H-pyran → 6-fluoro-5-methoxy-1'-{[5-(trifluoromethyl)furan-2-yl]methyl}spiro[1-benzofuran-3,3'-indol]-2'(1'H)-one

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Following the procedure as described in EXAMPLE 4 and making non-critical variations using 5-bromomethyl-2-(trifluoromethyl)furan to replace 2-(bromomethyl)tetrahydro-2H-pyran, and 6-fluoro-5-methoxyspiro[1-benzofuran-3,3′-indol]-2′(1′H)-one to replace 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2″(1′H)-one, 6-fluoro-5-methoxy-1′-{[5-(trifluoromethyl)furan-2-yl]methyl}spiro[1-benzofuran-3,3′-indol]-2′(1′H)-one was obtained (43%) as a colorless solid: mp 132-134° C.; 1H NMR (300 MHz, CDCl3) δ7.58 (d, J=9.4 Hz, 1H), 7.27 (dd, J=7.7, 7.7 Hz, 1H), 7.06-7.01 (m, 2H), 6.84 (d, J=7.9 Hz, 1H), 6.71-6.67 (m, 2H), 6.62 (d, J=12.1 Hz, 1H), 6.34 (d, J=3.4 Hz, 1H), 6.10 (d, J=3.4 Hz, 1H), 4.90 (d, J=16.3 Hz, 1H), 4.57 (d, J=12.8 Hz, 1H), 4.45 (d, J=12.7 Hz, 1H), 4.41 (d, J=16.2 Hz, 1H), 3.91 (s, 3H); MS (ES+) m/z 433.9 (M+1).

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