Stereochemical studies, 145. Saturated heterocycles, 152. Preparation and conformational analysis of stereoisomeric 1,6,7,11b- tetrahydro-2 [1,3]oxazino [4,3-a]isoquinolin-4-one derivatives
作者:László Lázár、Ferenc Fülöp、György Dombi、Gábor Bernáth、Gyula Argay、Alajos Kálmán
DOI:10.1016/s0040-4020(01)90539-3
日期:1990.1
unexpected reactions. High-resolution NMR revealed that the tetrahydroisoquino-line-fused C-1 epimer oxazinone derivatives 8 and 9 have different conformations in solution. The first X-ray diffraction evidence of the presence of two different conformations of oxazinoisoquinolines 8 and 9 in the solid state is provided.
从1- [双(羟甲基)-甲基] -6,7-二甲氧基-1、2、3、4-四氢异喹啉3a开始,合成了三官能的1,2,3,4-四氢异喹啉。从3a的-乙氧羰基衍生物中,(- 11b,c-1)-1-羟甲基-(8)和(-11b,-1)-1-氯甲基1-9,10-二甲氧基-1,6,7,llb在意外反应中形成了-tetrahydro-2 1,3]恶嗪[4,3- ]异喹啉-4-酮(9)。高分辨率NMR显示,四氢异喹啉-线融合的C-1差向异构体恶嗪酮衍生物8和9在溶液中具有不同的构象。X射线衍射的首次证据表明存在两种不同构型的恶嗪异喹啉提供固态的图8和9。