Synthesis, Skeletal Rearrangement, and Biological Activities of Spirooxindoles: Exploration of a Stepwise<i>C</i>-Piancatelli Rearrangement
作者:Li Huang、Xiaoyu Zhang、Jing Li、Ke Ding、Xuehui Li、Wenxu Zheng、Biaolin Yin
DOI:10.1002/ejoc.201301238
日期:2014.1
spiro[thieno-oxindoles] were rearranged under acidic conditions into thieno[2,3-c]quinolin-4-ones, involving an interesting dienone–phenol-like mechanism. The transformation of 2-furylcarbinols into spiro[pentenone-oxindoles] seems to be the first stepwise C-Piancatelli rearrangement. The spirooxindole products were biologically evaluated, and some of them showed promising cytotoxic activities against DU145 and
在我们先前研究的基础上,研究了2-呋喃基甲醇转化为螺呋喃吲哚的范围,以及螺[呋喃-羟吲哚]和螺[噻吩-羟吲哚]的骨架重排。螺[呋喃-羟吲哚]通过涉及4π-电子系统的旋转电环化的机制热重排成螺[戊烯酮-羟吲哚]。计算电环化步骤的自由能以解释立体化学结果。相比之下,spiro[thieno-oxindoles] 在酸性条件下重排为 thieno[2,3-c] quinolin-4-ones,涉及有趣的二烯酮-苯酚样机制。2-呋喃基甲醇转化为螺[戊烯酮-羟吲哚] 似乎是第一个逐步的 C-Piancatelli 重排。对螺环吲哚产品进行了生物学评价,