Lithium Hexamethyldisilazide → methyl 3-(3-cyclopentoxy-4-methoxyphenyl)-E-propenoate

Participants

Reaction Steps

To a solution of trimethylphosphonoacetate (13 mL, 82 mmol) in 36 mL of THF at 0° C. was added lithium bis(trimethylsilyl)amide (82 mL of 1M THF solution, 82 mmol). This solution was stirred for 20 min, and a solution of 3-cyclopentoxy-4-methoxybenzaldehyde (15 g, 68 mmol) in 30 mL of THF was then added dropwise via addition funnel. When reaction was judged complete by TLC analysis, the reaction was diluted with ethyl acetate:hexanes (1:1), and the organic layer was washed with H2O and brine. The organic layer was dried over MgSO4, filtered, and concentrated under reduced pressure to afford (E)-methyl-3-(3-cyclopentoxy-4-methoxyphenyl)-prop-2-en-oate as a pale yellow solid (17.2 g, 92%). 1H-NMR (300 MHz): δ 3.79 (s, 3), 3.86 (s, 3), 6.28 (d, 1, J=16), 7.52 (d, 1, J=16).

Provenance & Evidence