已经开发了用于合成N-烷基,N-酰基和N-磺酰基-2-氨基苯并[ d ]噻唑衍生物的新型固相方法。该过程中的关键步骤涉及通过2-碘苯基硫脲树脂3的环化反应制备与聚合物结合的2-氨基苯并[ d ]噻唑树脂5。通过将2-碘苯基异硫氰酸酯2添加到胺封端的连接酰胺树脂1中来生产树脂结合的2-碘苯基硫脲3。这些核心骨架的2-氨基苯并[ d ]噻唑树脂5经历与各种亲电子,如烷基卤,酰基氯,和磺酰氯官能化反应以产生Ñ -烷基,Ñ -酰基,和Ñ磺酰基-2-氨基苯并[ d ]噻唑树脂6,7,和8,分别。最后,Ñ -烷基,Ñ -酰基,和Ñ磺酰基-2-氨基苯并[ d ]噻唑衍生物9,10,和11,然后在良好的产率和纯度通过各树脂的切割产生6,7,和8 在二氯甲烷(DCM)中使用三氟乙酸(TFA)。
Regioselective N-alkylation of 2-aminobenzothiazoles with benzylic alcohols
作者:Feng Li、Haixia Shan、Qikai Kang、Lin Chen
DOI:10.1039/c1cc10604j
日期:——
The preparation of 2-(N-alkylamino)benzothiazoles via regioselecive N-alkylation of 2-aminobenzothiazoles has been accomplished by using benzylic alcohols as alkylating agents.
An Fe(III) catalyzed, efficient methodology for the synthesis of 2-aminobenzothiazole derivatives in water was established. This mild, base-free, one-pot strategy showcases the reaction of readily available 2-bromophenyl isothiocyanate with a broad range of substituted amines such as aliphatic, aromatic, primary, secondary and cyclic amines under air. Notably, the reaction afforded the corresponding
The first manganese catalyzed tandem methodology for the synthesis of 2-aminobenzothiazoles from 2-bromophenyl isothiocyanate and differently substituted amines has been demonstrated. This protocol employs environmentally benign, cost-effective and readily available MnCl2.4H2O as the catalyst under air. The present strategy exhibits wide substrate scope and affords differently substituted 2-aminobenzothiazoles