Regio- and stereoselective synthesis of spiro[1-benzothiepine-4(5<i>h</i>), 3′(3<i>h</i>)-pyrazol]-5-ones
作者:Nawal Mishriky、Adel S. Girgis、Hanaa M. Hosni、Hanaa Farag
DOI:10.1002/jhet.5570430618
日期:2006.11
refluxing benzene, afforded 2′,4′,5′-triaryl-2,2′,3,4′-tetrahydro-spiro[1-benzothiepine-4(5H),3′(3H)-pyrazol]-5-ones 5a-i and not the isomeric forms spiro[1-benzothiepine-4(5H),4′(4H)-pyrazol]-5-ones 6 in high regioselective manner. Single crystal X-ray diffraction studies of 5a, f, g indicated that the isolated products are 3′R, 4′ S.
(4 E)-4-芳基亚甲基-3,4-二氢-1-苯并噻吩-5(2 H)-ones 3a-e与亚硝胺(通过相应乙二酰氯4a,b的三乙胺脱卤化原位生成)在回流苯,得到2',4',5'-三芳基-2,2',3,4'-四氢-螺[1-苯并噻吩-4(5 H),3'(3 H)-吡唑] -5 -a 5a-i而非异构体以高区域选择性的方式形成螺[1-苯并噻庚因-4(5 H),4'(4 H)-吡唑] -5-ones 6。5a,f,g的单晶X射线衍射研究表明,分离出的产物为3'R,4 'S。