2-(Bromomethyl)tetrahydro-2H-pyran → 6-methoxy-5-methyl-1'-(pyridin-2-ylmethyl)spiro[1-benzofuran-3,3'-indol]-2'(1'H)-one

Participants

Reaction Steps

Following the procedure as described in EXAMPLE 4 and making non-critical variations using 6-methoxy-5-methylspiro[1-benzofuran-3,3′-indol]-2′(1′H)-one to replace 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2″(1′H)-one, and 2-(bromomethyl)pyridine hydrobromide to replace 2-(bromomethyl)tetrahydro-2H-pyran, 6-methoxy-5-methyl-1′-(pyridin-2-ylmethyl)spiro[1-benzofuran-3,3′-indol]-2′(1′H)-one was obtained (82%) as a colorless solid: mp 142-144° C.; 1H NMR (300 MHz, CDCl3) δ 8.56 (d, J=4.8 Hz, 1H), 7.67-7.60 (m, 1H), 7.28-7.11 (m, 4H), 7.00 (dd, J=7.5, 7.5 Hz, 1H), 6.90 (d, J=7.8 Hz, 1H), 6.50 (s, 2H), 5.09 (ABq, 2H), 4.84 (ABq, 2H), 3.79 (s, 3H), 2.00 (s, 3H); 13C NMR (75 MHz, CDCl3) δ178.0, 160.3, 159.2, 155.7, 149.5, 142.5, 142.2, 137.1, 132.6, 128.7, 124.3, 123.8, 123.5, 122.8, 121.7, 119.5, 119.2, 109.5, 93.8, 80.3, 58.0, 46.1, 22.6, 16.0; MS (ES+) m/z 373.3 (M+1).

Provenance & Evidence