2-(Bromomethyl)tetrahydro-2H-pyran → 2'-Oxo-1'-(pyridin-2-ylmethyl)-1',2'-dihydrospiro[1-benzofuran-3,3-indole]-6-carbonitrile

Participants

Reaction Steps

Following the procedure as described in EXAMPLE 4 and making non-critical variations using 2-(bromomethyl)pyridine hydrobromide to replace 2-(bromomethyl)tetrahydro-2H-pyran, and 2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-6-carbonitrile to replace 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one, 2′-oxo-1′-(pyridin-2-ylmethyl)-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-6-carbonitrile was obtained (89%) as a colorless solid: mp 151-153° C. (diethyl ether/hexanes); 1H NMR (300 MHz, CDCl3) δ 8.55 (d, J=3.9 Hz, 1H), 7.66 (t, J=7.5 Hz, 1H), 7.34-6.84 (m, 9H), 5.19 (d, J=15.8 Hz, 1H), 5.07 (d, J=9.2 Hz, 1H), 4.97 (d, J=15.8 Hz, 1H), 4.79 (d, J=9.2 Hz, 1H); 13C NMR (75 MHz, CDCl3) δ 176.3, 160.7, 155.1, 149.7, 142.3, 137.1, 134.8, 131.2, 129.5, 125.8, 124.6, 123.8, 122.9, 121.8, 118.5, 113.8, 113.3, 109.9, 80.21, 77.5, 57.9, 46.1; MS (ES+) m/z 353.9 (M+1).

Provenance & Evidence