Ring opening and ring-chain tautomerism in 2-carbalkoxy- and 2-acyl-2,3-dihydro-1,4-benzodioxins
作者:Vittorio Rosnati、Aldo Salimbeni
DOI:10.1016/s0040-4020(01)87297-5
日期:1986.1
1-chloro-2-(diethylamino)ethane partial ring cleavage occurred, while the tautomerism was evidenced. The esters were easily converted into mixtures of the corresponding lactones 6a-c and acids 7a-c by the action of NaH in DMSO. Ketones 2a and 2b were stable in the K2CO3/acetone system, but ring-chain tautomerism was shown to be at work in the case of 2b and 2c, while the latter also underwent ring cleavage. In the
研究了苯二恶英酯1a-c和酮2a-c在K 2 CO 3在丙酮中和NaH在DMSO中的行为。在酚类中间体或产物的清除剂存在下也进行了实验。在丙酮酸钾的作用下,该酯没有开环,并且不存在环链互变异构。然而,在1-氯-2-(二乙基氨基)乙烷存在下,部分环发生裂解,而互变异构现象得到了证明。通过在DMSO中的NaH的作用,酯容易地转化为相应的内酯6a-c和酸7a-c的混合物。酮2a和2b在K 2 CO 3中稳定/丙酮系统,但在2b和2c的情况下显示环链互变异构起作用,而后者也经历了环裂解。在相同的系统中,但是在存在烷基化剂的情况下,这三个酮很容易开环。