Direct Preparation of 3-Iodochromenes from 3-Aryl- and 3-Alkyl-2-propyn-1-ols with Diaryliodonium Salts and NIS
作者:Teppei Sasaki、Kotaro Miyagi、Katsuhiko Moriyama、Hideo Togo
DOI:10.1021/acs.orglett.5b03651
日期:2016.3.4
basis of a study of the O-phenylation of 3-phenyl-2-propyn-1-ol with diphenyliodonium triflate and t-BuONa, a variety of 4-aryl-3-iodo-2H-benzopyrans were prepared in good to moderate yields in one pot from the reaction of 3-aryl-2-propyn-1-ols with diaryliodonium triflates and t-BuONa, followed by the treatment with N-iodosuccinimide and BF3·OEt2, under transition-metal-free and mild conditions. The formed
上的研究的基础上Ó的-phenylation 3-苯基-2-丙炔-1-醇与三氟甲磺酸二苯基碘鎓和吨-BuONa,各种4-芳基-3-碘-2- ħ良好制备-benzopyrans -3-芳基-2-丙炔-1-醇与二芳基碘鎓三氟甲磺酸盐和t- BuONa的反应,然后在无过渡金属的条件下,用N-碘代琥珀酰亚胺和BF 3 ·OEt 2处理,在一个锅中使中等收率达到中等和温和的条件。将形成的4-苯基-3-碘-2 H-苯并吡喃转化为4-苯基-2 H-苯并吡喃衍生物通过Pd催化的偶联反应在3位上通过C–C键形成,并与氧化剂一起形成香豆素。