Reagent-Controlled Divergent Synthesis of 2-Amino-1,3-Benzoxazines and 2-Amino-1,3-Benzothiazines
作者:V. P. Rama Kishore Putta、Nagaraju Vodnala、Raghuram Gujjarappa、Ujjawal Tyagi、Aakriti Garg、Sreya Gupta、Prasad Pralhad Pujar、Chandi C. Malakar
DOI:10.1021/acs.joc.9b02384
日期:2020.1.17
devised for the synthesis of 4H-1,3-benzoxazines and related biologically important heterocycles in high yields under mild conditions. These scaffolds could be efficiently constructed using two different chemoselective reactions that rely on the choice of reagents and reaction conditions. The treatment of various 2-amino-arylalkyl alcohols with isothiocyanates afforded thiourea intermediates, which were
已经设计了一种试剂控制的化学选择性方法,用于在温和条件下以高收率合成4H-1,3-苯并恶嗪和相关的生物学重要杂环。可以使用两种不同的化学选择性反应有效地构建这些支架,这取决于试剂的选择和反应条件。用异硫氰酸酯处理各种2-氨基-芳基烷基醇,得到硫脲中间体,在三乙胺的存在下,将其与分子碘原位反应,生成2-氨基-4H-1,3-苯并恶嗪,而相应的2-氨基-通过在T3P(温和的环脱水剂)和三乙胺作为碱的存在下,硫脲中间体的反应获得4H-1,3-苯并噻嗪。所描述的协议代表了4H-1合成的第一个例子,