反应详情

温度

-78 °C

To a stirring solution of 1-bromo-3-iso-propyl-4-methoxy-2-methyl-benzene (compound 7-16, step c; 0.7 g, 2.88 mmol) in THF (20 mL) at −78° C. was added n-BuLi (1.6 mL, 2.5 M in hexanes). The mixture was stirred at −78° C. for 1 hr and 4-methoxy-2-methyl-benzaldehyde (0.37 mL, 2.74 mmol) was added. The reaction mixture was stirred at −78° C. for 1 hr, allowed to warm to room temperature and stirred for 1 hr. The reaction mixture was quenched with saturated NH4Cl and diluted with diethyl ether. The organic layer was dried over Na2SO4, filtered and concentrated under reduced pressure to afford crude (4′-methoxy-3′-iso-propyl-2′-methylphenyl)-(4-methoxy-2-methylphenyl)-methanol as a light yellow oil (1.0 g, 100%). This crude oil was dissolved into EtOAc (25 mL) and AcOH (5 mL) and Pd/C (0.1 g) was added. After stirring at rt for 6 hours, the reaction mixture was filtered through the Celite and concentrated under reduced pressure to afford crude 4-(4′-methoxy-2′-methyl-3′-iso-propylbenzyl)-3-methyl-anisole as a yellow oil (0.8 g, 93%): 1H NMR (300 MHz, DMSO-d6): δ 6.88-6.80 (m, 5 H), 3.77 (s, 2 H), 3.74 (s, 3 H), 3.71 (s, 3. H), 3.34 (m, 1 H), 2.22 (s, 3 H), 2.14 (s, 3 H), 1.28 (d, J=6.9 Hz, 6 H); TLC conditions: Uniplate silica gel, 250 microns; Mobile phase=8% ethyl acetate in hexanes; Rf=0.56.

1. stirringThe reaction mixture was stirred at −78° C. for 1 hr
2. temperatureto warm to room temperature
3. stirringstirred for 1 hr
4. customThe reaction mixture was quenched with saturated NH4Cl
5. additiondiluted with diethyl ether
6. dry with materialThe organic layer was dried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure