Studies on benzothiazoline derivatives. III. Reactions of 2,2-disubstituted benzothiazolines with haloacyl halides or acid anhydrides.
作者:MIKIO HORI、TADASHI KATAOKA、HIROSHI SHIMIZU、YUTAKA IMAI
DOI:10.1248/cpb.27.1973
日期:——
A new ring transformation of benzothiazolines to 3-oxo-2, 3-dihydro-4H-1, 4-benzothiazines or benzothiazoles was found in the reactions of 2, 2-disubstituted benzothiazolines (3-5) with haloacyl halides. N, S-Bis (haloacyl) o-aminobenzenethiols were key intermediates of the reactions. In the case of benzothiazoline (1) and 2-methylbenzothiazoline (2), N-acylated products were obtained. Reactions with acid chlorides or acid anhydrides gave the N-acylated compounds in good yields.
在2,2-二取代苯并噻唑啉(3-5)与酰卤的反应中,发现了一种新的环转化,生成3-氧代-2,3-二氢-4H-1,4-苯并噻嗪或苯并噻唑。N,S-双(酰卤)邻氨基苯硫醇是反应的关键中间体。对于苯并噻唑啉(1)和2-甲基苯并噻唑啉(2),得到了N-酰化产物。与酰氯或酸酐的反应以良好产率得到N-酰化化合物。