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首页> 外文期刊>Acta Crystallographica Section E: Crystallographic Communications >Crystal structure of 13-(E)-(2-amino­benzyl­idene)parthenolide
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Crystal structure of 13-(E)-(2-amino­benzyl­idene)parthenolide

机译:13-(E)-(2-氨基亚苄基)二十二烷基苯酚的晶体结构

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The title compound, C21H25NO3 [systematic name: (1aR,4E,7aS,8E,10aS,10bR)-8-(2-amino­benzyl­idene)-1a,5-dimethyl-2,3,6,7,7a,8,10a,10b-octa­hydro­oxireno[2′,3′:9,10]cyclo­deca­[1,2-b]furan-9(1aH)-one], was synthesized by the reaction of parthenolide [systematic name (1aR,7aS,10aS,10bS,E)-1a,5-dimethyl-8-methyl­ene-2,3,6,7,7a,8,10a,10b-octa­hydro­oxireno[2′,3′:9,10]cyclo­deca­[1,2-b]furan-9(1aH)-one] with 2-iodo­aniline via Heck reaction conditions. The mol­ecule is composed of fused ten-, five- (lactone), and three-membered (epoxide) rings. The lactone ring shows a flattened envelope-type conformation (r.m.s. deviation from planarity = 0.0477 Å), and bears a 2-amino­benzyl­idene substituent that is disordered over two conformations [occupancy factors 0.901 (4) and 0.099 (4)]. The ten-membered ring has an approximate chair–chair conformation. The dihedral angle between the 2-amino­benzyl­idine moiety (major component) and the lactone ring (mean plane) is 59.93 (7)°. There are no conventional hydrogen bonds, but there are a number of weaker C—H⋯O-type inter­actions.
机译:标题化合物C21H25NO3 [系统名称:(1aR,4E,7aS,8E,10aS,10bR)-8-(2-氨基亚苄基)-1a,5-二甲基-2,3,6,7,7a,8,10a通过小白菊内酯的反应[系统名称(1aR,7aS,10aS,]合成了10b-八氢氧杂壬酸[2',3':9,10]环癸[1,2-b]呋喃-9(1aH)-one]。 10bS,E)-1a,5-二甲基-8-亚甲基-2,3,6,7,7a,8,10a,10b-八氢氧杂壬酸[2',3':9,10] cyclodeca [1,2-b [呋喃-9(1aH)-one]与2-碘苯胺通过Heck反应条件。该分子由稠合的十,五(内酯)和三元(环氧化物)环组成。内酯环显示出扁平的包膜型构象(相对于平面度的r.m.s.偏差= 0.0477)),并带有2-氨基亚苄基取代基,该取代基在两个构象上无序[占有率0.901(4)和0.099(4)]。十元环具有近似的椅子构型。 2-氨基苄基部分(主要成分)和内酯环(平均平面)之间的二面角为59.93°(7)°。没有常规的氢键,但是有许多较弱的C-H = O型相互作用。

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