tert-Butyl methacrylate → 1,1-Dimethylethyl(2E)-3-{4-[(4-hydroxyphenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenyl}-2-methyl-2-propenoate

Participants

Reaction Steps

The general Heck reaction procedure, described for 15 was followed. 4-[(4-bromophenyl)(2,2,6,6-tetramethyltetrahydro-4H-pyran-4-ylidene)methyl]phenol (211) (0.440 g, 1.096 mmol) was reacted with 1,1-dimethylethyl 2-methyl-2-propenoate in the presence of PdCl2(PPh3)2 to afford the title compound as a mixture of Z and E isomers. The pure E-isomer (212) was isolated by HPLC as a white solid. 1H NMR (300 MHz, CDCl3): δ 7.58 (s, 1H), 7.34 (d, J=8.1 Hz, 2H), 7.19 (d, J=8.1 Hz, 2H), 7.05 (d, J=8.4 Hz, 2H), 7.81 (d, J=8.4 Hz, 2H), 5.80 (br s, 1H), 2.30 (d, J=3.0 Hz, 4H), 2.10 (s, 3H), 1.56 (s, 9H), 1.27 (s, 12H). LCMS (ESI): m/z 461 (M−H)−.

Provenance & Evidence