4-bromo-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-1-methyl-1,3-dihydro-2H-indol-2-one → 4'-bromo-1'-methyl-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1H)-one

Participants

Reaction Steps

Following the procedure as described in EXAMPLE 2.40 and making non-critical variations using 4-bromo-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-1-methyl-1,3-dihydro-2H-indol-2-one to replace 2-fluoro-4-hydroxy-5-[1-(4-methoxybenzyl)-2-oxo-2,3-dihydro-1H-indol-3-yl]benzonitrile, 4′-bromo-1′-methyl-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1H)-one was obtained (95%): 1H NMR (300 MHz, CDCl3) δ 7.23-7.14 (m, 2H), 6.87-6.79 (m, 1H), 6.43 (s, 1H), 6.16 (s, 1H), 4.93 (ABq, 2H), 4.22-4.07 (m, 4H), 3.24 (s, 3H); MS (ES+) m/z 387.9 (M+1), 389.9 (M+1).

Provenance & Evidence