On water: iodine-mediated direct construction of 1,3-benzothiazines from <i>ortho</i>-alkynylanilines by regioselective 6-<i>exo-dig</i> cyclization
作者:Kapil Mohan Saini、Rakesh K. Saunthwal、Shiv Kumar、Akhilesh K. Verma
DOI:10.1039/c9ob00128j
日期:——
Herein, we report the 6-exo-dig ring closure of ortho-alkynylanilines with readily available aroyl isothiocyanate. An environmentally benign, metal- and base-free, iodine promoted cascade synthesis of highly functionalized (benzo[1,3]thiazin-2-yl)benzimidic acids has been accomplished via in situ generated ortho-alkynylthiourea. The established methodology employs the abundant chemical feedstock of
在本文中,我们报道了邻-炔基苯胺与现成的芳基异硫氰酸酯的6 -exo-dig闭环反应。通过原位生成的邻位炔基硫脲已实现了对环境无害,无金属和无碱的碘促进的高度官能化(苯并[1,3]噻嗪-2-基)苯并咪唑酸的级联合成。既定的方法利用了邻位的丰富化学原料-炔基苯胺和芳基异硫氰酸酯,可用于药物活性的1,3-苯并噻嗪分子的后期合成。此外,发现的协议专门提供双(苯并[1,3]噻嗪-2-基)二苯甲亚胺酸产物,并保留了碘-烯烃取代模式,可以通过进一步衍生化来利用。