反应详情

A solution of 3.1 g (15.6 mmol) of ethyl 2-isopropylthiazole-4-carboxylate in 50 ml of dichloromethane was cooled under N2 atmosphere to -78° C. and treated dropwise with 15.6 ml (23.4 mmol) of a 1.5M solution of diisobutylaluminum hydride in toluene over a period of 1.5 h. After being stirred for an additional 0.5 h, the solution was quenched with 5 ml of methanol followed by 15 ml of aqueous Rochelle's salt. The resulting mixture was partitioned between chloroform and aqueous Rochelle's salt, dried over Na2SO4, and concentrated to provide 1.37 g (56%) of the crude desired compound, Rf 0.47 (20% ethyl acetate in hexane). 1H NMR (CDCl3) δ1.45 (d, J=7 Hz, 6H), 3.39 (heptet, J=7 Hz, 1H), 8.07 (s, 1H), 10.00 (s, 1H). Mass spectrum: (M+H)+ =156.

1. customthe solution was quenched with 5 ml of methanol
2. customThe resulting mixture was partitioned between chloroform and aqueous Rochelle's salt
3. dry with materialdried over Na2SO4
4. concentrationconcentrated