4-(Bromomethyl)oxane → 5,6-dimethyl-1'-(tetrahydro-2H-pyran-4-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 5,6-dimethylspiro[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 4-bromomethyltetrahydropyrane to replace 2-(bromomethyl)-5-(trifluoromethyl)furan, 5,6-dimethyl-1′-(tetrahydro-2H-pyran-4-ylmethyl)spiro[1-benzofuran-3,3′-indol]-2′(1′H)-one was obtained (55%) as a colorless solid: mp 199-201° C. (ethyl acetate/hexanes); 1H NMR (300 MHz, CDCl3) 7.32-7.27 (m, 1H), 7.14-7.12 (m, 1H), 7.05-7.00 (m, 2H), 6.91-6.89 (m, 1H), 6.75 (s, 1H), 6.41 (s, 1H), 4.71 (ABq, 2H), 4.12-3.95 (m, 2H), 3.75-3.54 (m, 2H), 3.39-3.28 (m, 2H), 2.19-2.02 (m, 7H), 1.62-1.28 (m, 4H); 13C NMR (75 MHz, CDCl3) δ177.9, 159.1, 142.8, 138.5, 132.6, 129.4, 128.7, 125.8, 124.0, 123.7, 123.2, 111.4, 108.5, 79.9, 67.4, 58.0, 46.0, 33.9, 30.8, 20.3, 19.3; MS (ES+) m/z 364.3 (M+1).

Provenance & Evidence