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

Participants

Reaction Steps

Following the procedure as described in EXAMPLE 9 and making non-critical variations using 6-methoxyspiro[1-benzofuran-3,3′-indol]-2′(1′H)-one to replace 3-methylspiro[furo[3,2-f][1,2]benzisoxazole-5,3′-indol]-2′(1′H)-one, and 2-(bromomethyl)tetrahydro-2H-pyran to replace 2-(bromomethyl)-5-(trifluoromethyl)furan, 6-methoxy-1′-(tetrahydro-2H-pyran-2-ylmethyl)spiro[1-benzofuran-3,3′-indol]-2′(1′H)-one was obtained (54%) as a colorless foam; 1H NMR (300 MHz, CDCl3) δ 7.28 (dd, J=7.5, 7.5 Hz, 1H), 7.20-6.98 (m, 3H), 6.66-6.49 (m, 2H), 6.41-6.33 (m, 1H), 4.99-4.91 (m, 1H), 4.74-4.66 (m, 1H), 4.02-3.31 (m, 8H), 1.92-1.19 (m, 6H); MS (ES+) m/z 366.4 (M+1).

Provenance & Evidence