Furan-3-boronic acid → 4'-(3-furyl)-1'-(pyridin-2-ylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b']difuran-3,3'-indol]-2'(1'H)-one

Participants

Reaction Steps

Following the procedure as described in EXAMPLE 4, and making non-critical variations using 4′-bromo-1′-(pyridin-2-ylmethyl)-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one to replace 4′-bromo-1′-pentylspiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-2′(1′H)-one, and 3-furanboronic acid to replace [6-(dimethylamino)pyridin-3-yl]boronic acid, the title compound was obtained (75%) as a colorless solid: mp 195-197° C.; 1H NMR (300 MHz, CDCl3) δ 8.58 (d, 1H), 7.68 (t, 1H), 7.32-7.21 (m, 4H), 6.97 (d, 1H), 6.92 (d, 1H), 6.77 (s, 1H), 6.60 (s, 1H), 6.35 (s, 1H), 5.99 (s, 1H), 5.12 (ABq, 2H), 4.71 (ABq, 2H), 4.57 (t, 2H), 3.03 (t, 2H); MS (ES+) m/z 437.4 (M+1).

Provenance & Evidence