反应详情

Butyllithium (8.28 ml. of 2.5M in hexane, 20.69 mmole) was added to a solution of 1-methoxy-3 methoxymethoxy benzene (3.62 g., 21.55 mmole, (T. Kaufman, R. Srivastava, R. Sindelar, J. Med. Chem. 1995, 38, 1437-1445) in. THF (15 mL) at −30° C. The solution was stirred at ambient temperature for 1 hour, cooled to at 0° C. and anhydrous zinc chloride beads (3.5 g, 25.67 mmole) added. The mixture was stirred for 2 hours at 25°. Then a solution of N-methoxy-N-methyl-2-bromo-5-nitrobenzamide (5.00 g, 17.24 mmole) dissolved in THF (20 mL) was added. Bis (triphenylphosphine) palladium dichloride (600 mg.) was added and the solution was stirred at 65° C. for 15 hours. After cooling, chloroform was added and the solution stirred with aqueous KHCO3. The precipitated zinc salts were filtered, the water layer removed and the organic layer dried (Na2SO4), filtered concentrated under reduced pressure and the residuepurified on silica gel eluting with 8% ethyl acetate in CH2Cl2 to provide the titled compound (5.68 g, 88% yield).

1. customat −30° C
2. additionadded
3. stirringThe mixture was stirred for 2 hours at 25°
4. additionwas added
5. stirringthe solution was stirred at 65° C. for 15 hours
6. temperatureAfter cooling
7. filtrationThe precipitated zinc salts were filtered
8. customthe water layer removed
9. dry with materialthe organic layer dried (Na2SO4)
10. filtrationfiltered
11. concentrationconcentrated under reduced pressure