Synthesis and structure of 6-bromo-4-hydroxy-2,3-tetramethylene-3,4-dihydroquinazoline and its mixed crystal with 4-hydroxy-2,3-tetramethylene-3,4-dihydroquinazoline
作者:N. I. Mukarramov、R. Ya. Okmanov、F. R. Utaeva、K. K. Turgunov、B. Tashkhodzhaev、Z. M. Khakimova、Kh. M. Shakhidoyatov
DOI:10.1007/s10600-010-9491-y
日期:2009.11
Bromination of the alkaloid 2,3-tetramethylene-3,4-dihydroquinazoline by N-bromosuccinimide was studied. It was shown that either 4-hydroxy-2,3-tetramethylene-3,4-dihydroquinazoline or 6-bromo-4-hydroxy-2,3tetramethylene-3,4-dihydroquinazoline was formed depending on the ratio of reagents. Oxidation of 2,3tetramethylene-3,4-dihydroquinazoline by KMnO4 produced 4-hydroxy-2,3-tetramethylene-3,4dihydroquinazoline. The crystal structures of 6-bromo-4-hydroxy-2,3-tetramethylene-3,4-dihydroquinazoline and its mixed crystal with 4-hydroxy-2,3-tetramethylene-3,4-dihydroquinazoline were studied by x-ray structure analysis. The enantiomeric molecules in all crystal structures formed associates owing to two opposing OH...N1 H-bonds.
研究了N-溴代琥珀酰亚胺对生物碱2,3-四亚甲基-3,4-二氢喹唑啉的溴化作用。结果表明,根据试剂的比例,可以形成4-羟基-2,3-四亚甲基-3,4-二氢喹唑啉或6-溴-4-羟基-2,3-四亚甲基-3,4-二氢喹唑啉。KMnO4对2,3-四亚甲基-3,4-二氢喹唑啉的氧化作用产生了4-羟基-2,3-四亚甲基-3,4-二氢喹唑啉。通过X射线结构分析研究了6-溴-4-羟基-2,3-四亚甲基-3,4-二氢喹唑啉及其与4-羟基-2,3-四亚甲基-3,4-二氢喹唑啉的混合晶体的晶体结构。由于两个相反的OH...N1氢键,所有晶体结构中的对映体分子形成了关联。