1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one → 6-(((R)-tetrahydrofuran-2-yl)methyl)-2,3,5',6'-tetrahydro-2'H-spiro[[1,4]dioxino[2,3-f]indole-8,3'-benzofuro[6,5-b]furan]-7(6H)-one

Participants

Reaction Steps

Following the procedure as described in EXAMPLE 2 and making non-critical variations using 8-(6-hydroxy-2,3-dihydrobenzofuran-5-yl)-6-(((R)-tetrahydrofuran-2-yl)methyl)-6,8-dihydro-2H-[1,4]dioxino[2,3-f]indol-7(3H)-one to replace 1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one, 6-(((R)-tetrahydrofuran-2-yl)methyl)-2,3,5′,6′-tetrahydro-2′H-spiro[[1,4]dioxino[2,3-f]indole-8,3′-benzofuro[6,5-b]furan]-7(6H)-one was obtained (39%) as a colorless solid: mp 220-225° C.; 1H NMR (300 MHz, CDCl3) δ6.65 (s, 1H), 6.64-6.60 (m, 1H), 6.51-6.46 (m, 1H), 6.36 (s, 1H), 4.72 (dd, J=84.4, 8.9 Hz, 2H), 4.51 (dd, J=8.6, 8.6 Hz, 2H), 4.25-4.19 (m, 2H), 4.19-4.13 (m, 2H), 3.94-3.82 (m, 2H), 3.80-3.67 (m, 2H), 3.64-3.52 (m, 1H), 2.98 (t, J=8.6 Hz, 2H), 2.08-1.94 (m, 1H), 1.94-1.80 (m, 2H), 1.74-1.60 (m, 1H); MS (ES+) m/z 421.9 (M+1).

Provenance & Evidence