1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one → 1'-(diphenylmethyl)-4',6'-dimethoxy-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one

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Reaction Steps

Following the procedure as described in EXAMPLE 2 and making non-critical variations using 1-(diphenylmethyl)-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-4,6-dimethoxy-1,3-dihydro-2H-indol-2-one to replace 1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one, 1′-(diphenylmethyl)-4′,6′-dimethoxy-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (96%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ7.41-7.24 (m, 10H), 6.97 (s, 1H), 6.42 (s, 1H), 6.19 (s, 1H), 6.04 (d, J=1.8 Hz, 1H), 5.69 (d, J=1.8 Hz, 1H), 4.81 (ABq, 2H), 4.21-4.06 (m, 4H), 3.62 (s, 3H), 3.47 (s, 3H); MS (ES+) m/z 522.1 (M+1).

Provenance & Evidence