1'-(diphenylmethyl)-4',6'-dimethoxy-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-2'(1'H)-one → 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 3 and making non-critical variations using 1′-(diphenylmethyl)-4′,6′-dimethoxy-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one to replace 1′-(diphenylmethyl)-6-methoxy-5-methylspiro[1-benzofuran-3,3′-indol]-2′(1′H)-one, 4′,6′-dimethoxy-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1H)-one was obtained (55%): 1H NMR (300 MHz, CDCl3) δ10.42 (s, 1H), 6.35 (s, 1H), 6.15 (d, J=2.0 Hz, 1H), 6.10 (d, J=2.0 Hz, 1H), 6.08 (s, 1H), 4.58 (ABq, 2H), 4.17-4.03 (m, 4H), 3.72 (s, 3H), 3.58 (s, 3H); MS (ES+) m/z 356.1 (M+1).

Provenance & Evidence