反应详情

To a cooled (dry ice) mixture of 3,5-dibromobenzyl alcohol (1 g, 3.8 mmol) and PdCl2(dppf)[0.07 eq] in dry THF (10 mL) was added 1.1 M Et2Zn (15 mL, 16 mmol, 4.4 eq). The resulting mixture was allowed to warm to RT, stirred at 45° C. (programmed block temperature, overnight). To bring the reaction to completion (disappearance of both starting material and monoalkylated product) additional 1.1 M Et2Zn (10 mL, 11 mmol, 2.9 eq) was added with continued stirring at 45° C. (again overnight). After cooling, the reaction mixture was then added to a stirred mixture of dilute HCl and heptane/EtOAc (2:1; ˜200 mL), and the organic layer was dried (Na2SO4), filtered, and evaporated. Chromatography (10% EtOAc/heptane) gave 0.33 g (yield of 53%) of title product. 1H NMR (300 MHz, CDCl3) δ 1.22 (t, 6H), 1.65 (br s, 1H), 2.61 (q, 4H), 4.66 (s, 2H), 6.95-7.05 (m, 3H).

1. temperatureTo a cooled
2. additionwas added
3. stirringwith continued stirring at 45° C. (again overnight)
4. temperatureAfter cooling
5. dry with materialthe organic layer was dried (Na2SO4)
6. filtrationfiltered
7. customevaporated