NMR and X-ray structural study of saturated ( p-chlorophenyl)pyrrolo[1,2-a][3,1]benzoxazin-1-ones prepared from aroylisobutyric acid and cyclic amino alcohols. High energy barriers for hindered rotation of bridgehead phenyl groups
作者:Petri Tähtinen、Reijo Sillanpää、Géza Stájer、Angela E. Szabó、Kalevi Pihlaja
DOI:10.1039/a905445f
日期:——
From 2-methyl-3-(p-chlorobenzoyl)propionic acid with stereoisomeric cyclic saturated or partly saturated cis and trans 1,3-amino alcohols and bicyclic amino alcohols, tri- and tetracyclic methyl substituted (p-chlorophenyl)pyrrolo[1,2-a][3,1]benzoxazin-1-ones and methylene bridged derivatives were prepared. For comparison, the bicyclic oxazolone and oxazinone analogs were also prepared. In each case
由具有立体异构的环状饱和或部分饱和的顺式和反式1,3-氨基醇和双环氨基醇的2-甲基-3-(对氯苯甲酰基)丙酸,三环和四环甲基取代的(对氯苯基)吡咯[1, 2-一个] [3,1]苯并恶嗪-1-酮和亚甲基桥接,制备衍生物。为了比较,还制备了双环恶唑酮和恶嗪酮类似物。在每种情况下,形成在芳基和甲基的相互位置不同的异构对。对于亚甲基桥接的衍生物,分离异构体。用于评估溶液1 H,13 C 1中的结构使用H},NOE差,COZY和HMQC NMR方法,并且对于晶体结构确定,使用X射线衍射测量。对于顺式,二烯基和二烯基熔融的化合物,测量了桥头对氯苯基受限制旋转的异常高的自由能垒。