一种简便方法要变换的反式-4-羧基-3,4-二氢-3-苯基-1(2H)-isoquinolones到茚并[1,2- C ^ ]异喹啉
摘要:
茚并[1,2- c ]异喹啉是一类重要的具有抗癌活性的拓扑异构酶I抑制剂。Schiff碱与高邻苯二甲酸酐的缩合提供了顺式和反式-4-羧基-3,4-二氢-3-苯基-1(2 H)异喹诺酮的混合物。尽管顺式产物可以很容易地与亚硫酰氯转化为茚并[1,2- c ]异喹啉,但是使用这种方法,反式产物不能提供茚并[1,2- c ]异喹啉。本报告介绍了使用亚硒酸酯消除和Friedel-Crafts环化化学方法将反式非对映异构体转化为茚并[1,2- c ]异喹啉的途径。
On the mechanism of conversion of 4-carboxy-3,4-dihydro-3-phenyl-1(2H)-isoquinolones to indeno[1,2-c]isoquinolines by thionyl chloride
作者:Xiangshu Xiao、Andrew Morrell、Phillip E. Fanwick、Mark Cushman
DOI:10.1016/j.tet.2006.07.072
日期:2006.10
It has been known for a long time that thionylchloride can effectively mediate the transformation of 4-carboxy-3,4-dihydro-3-phenyl-1(2H)-isoquinolones to indeno[1,2-c]isoquinolines. The mechanism of this unique transformation, however, remains to be established. Evidence is presented to demonstrate that (1) the two-electron dehydrogenation precedes Friedel–Crafts cyclization and (2) the two-electron
长期以来,人们已经知道亚硫酰氯可以有效地介导4-羧基-3,4-二氢-3-苯基-1(2 H)-异喹诺酮向茚并[1,2- c ]异喹啉的转化。但是,这种独特转变的机制仍有待建立。证据表明,(1)二电子脱氢先于Friedel-Crafts环化,(2)二电子脱氢通过H-4脱质子化,然后内酰胺部分进行O-亚磺酰化,而不是C-亚磺酰化。碳α到羧基。
CUSHMAN M.; CHENG L., J. ORG. CHEM., 1978, 43, NO 19, 3781-3783