Highly Diastereoselective Synthesis of C(6)-Functionalized Dihydroimidazotriazines
作者:Ethel Garnier、Jérôme Guillard、Eric Pasquinet、Franck Suzenet、Didier Poullain、Christian Jarry、Jean-Michel Léger、Bruno Lebret、Gérald Guillaumet
DOI:10.1021/ol035743e
日期:2003.11.1
[reaction: see text] The first examples of C(6)-substituted 7-hydroxy-6,7-dihydro-5H-imidazo[1,2-b][1,2,4]triazines have been prepared by ring closure of different 5(2H)-1,2,4-triazin-3-ones 1a-c with 40% aqueous glyoxal and various nucleophiles (alcohols, thiols, or amines). The structure and exact stereochemistry of 2a was established by a single X-ray diffraction study and (1)H and (13)C NMR spectra
[反应:见正文]通过闭环制备了C(6)-取代的7-羟基-6,7-二氢-5H-咪唑并[1,2-b] [1,2,4]三嗪的第一个实例40%乙二醛水溶液和各种亲核试剂(醇,硫醇或胺)的不同5(2H)-1,2,4-三嗪-3-酮1a-c的组成。通过一次X射线衍射研究以及(1)H和(13)C NMR光谱分析,确定了2a的结构和确切的立体化学。结果表明,该过程是完全区域选择性和非对映选择性的。提出了一种涉及亚胺中间体的机理。