1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one → 7'-chloro-1'-(diphenylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-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 7-chloro-1-(diphenylmethyl)-3-(6-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-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, 7′-chloro-1′-(diphenylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one was obtained (80%) as a colorless solid: 1H NMR (300 MHz, DMSO-d6) δ7.45-7.06 (m, 14H), 6.38-6.32 (m, 2H), 4.75 (s, 2H), 4.48 (t, J=8.7 Hz, 2H), 2.94 (t, J=8.7 Hz, 2H).

Provenance & Evidence