1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one → 5-(benzyloxy)-1'-(diphenylmethyl)spiro[1-benzofuran-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 3-[5-(benzyloxy)-2-hydroxyphenyl]-1-(diphenylmethyl)-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, 5-(benzyloxy)-1′-(diphenylmethyl)spiro[1-benzofuran-3,3′-indol]-2′(1′H)-one was obtained (88%): 1H NMR (300 MHz, CDCl3) δ7.43-7.26 (m, 15H), 7.17-7.10 (m, 1H), 7.06 (s, 1H), 7.05-6.91 (m, 2H), 6.90-6.76 (m, 2H), 6.55-6.46 (m, 1H), 6.30-6.23 (m, 1H), 4.85 (ABq, 2H), 4.79 (s, 2H).

Provenance & Evidence