反应详情

A 1 M solution of BBR in MCH2C12 (23 ml., 0.022 mol) was cooled to -80° C. in a dry ice/acetone bath stirred for 20 minutes. (The reaction was accomplished under a nitrogen atmosphere.) A suspension of 6-ethoxy-2-benzothiazolesulfonamide (0.5g., 0.002 mol) in 75 ml of CH2Cl2 was added slowly to the coole bath and stirred at room temperature overnight. The reaction was poured into ice water and filtered to yield 0.35 g of product (73.8% yield). The product was purified by recrystallization from methanol and water. m.p. 209° C.; NMR(DMSO-D6), δ8.4 (s, lH), 8.3-7.0 (m, 3H), 3.5 (s, 2H); DMSO-D6 /D2O)6 δ8.3-7.0 (m, 3H), 4.2 (s, 2H).

1. additionwas added slowly to the coole bath
2. stirringstirred at room temperature overnight
3. filtrationfiltered