7-Fluoro-1,2,3,4-tetrahydronaphthalen-1-one → E-N-Cyclopropyl-2-(7-fluoro-1,2,3,4-tetrahydro-1-naphthylidene)acetamide

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Reaction Steps

This compound was prepared in an analogous manner to Example 12f with the replacement of 5-fluoro1-tetralone and diethyl (cyclopropylcarbamoyl)methyl phosphonate with 7-fluoro-1-tetralone (7.76 g, 0.05 mol) and diethyl(cyclo propylcarbamoyl)methylphosphonate (11.1 g, 0.05 mol). Chromatography on Silica gel using ethyl acetate:hexanes (1:2) as eluent gave 4.38 g (37%) of (E)-N-Cyclopropyl-2-(7-fluoro-1,2,3,4-tetrahydro-1-naphthylidene) acetamide, m.p., 122.8°-123.3° C.; NMR (DMSO-d6): d 8.00 (d, J=4.0 Hz,1H), 7.32 (dd, J=11.2 Hz,1H), 7.04-7.23 (m, 2H), 6.33 (s, 1H), 3.06 (m,2H), 2.69 (m, 3H), 1.70 (m, 2H), 0.66 (m, 2H), 0.40 (m, 2H); steady-state nOe: irradiation at 6.39 d, observed significant nOe at 7.32 d.

Provenance & Evidence