Stereoselective synthesis of (1R,3R,4R)-3-(1,2,4-triazolo[4,3-x]azin-3-yl)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ones
作者:Uroš Grošelj、Simon Rečnik、Jurij Svete、Anton Meden、Branko Stanovnik
DOI:10.1016/s0957-4166(02)00208-2
日期:2002.5
(1R,3R,4R)-3-(1,2,4-Triazolo[4,3-x]azin-3-yl)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-ones were prepared in 68-94% d.e. in three steps from (IR)-(+)-camphor via coupling of (1R,4R)-3-[(E)-(dimethylamino)methylidene]-1 17,7-trimethylbicyclo[2.2.1]heptan-2-one with hydrazinoazines followed by oxidative cyclisation of the intermediate hydrazones with methanolic bromine. The structures were determined by 2D NMR techniques and NOESY spectroscopy as well as by X-ray diffraction. (C) 2002 Elsevier Science Ltd. All rights reserved.
(1R,3R,4R)-3-(1,2,4-三唑并[4,3-x]嗪-3-基)-1,7,7-三甲基双环[2.2.1]庚烷-2-酮是从 (IR)-(+)-樟脑出发,通过 (1R,4R)-3-[(E)-(二甲基氨基)甲亚基]-1,17,7-三甲基双环[2.2.1]庚烷-2-酮与杂环氨基化合物的缩合反应,随后对中间体的腙进行甲醇溴的氧化环化反应,在三步反应中以 68-94% 的d.e.值成功制备。通过二维核磁共振技术、NOESY 谱和 X 射线衍射对化合物的结构进行了表征。
(C) 2002 Elsevier Science Ltd. 保留所有权利。