Tetradehydro-Diels–Alder Reactions of Flexible Arylalkynes via Folding Inside a Molecular Cage
作者:Georgi R. Genov、Hiroki Takezawa、Harumi Hayakawa、Makoto Fujita
DOI:10.1021/jacs.3c06301
日期:2023.8.9
employed substrates allows for efficientencapsulationwithin the host cavity. The rate of thermal cyclization of the encapsulated guest was found to be greatly enhanced, and high product selectivity for an unsymmetrical substrate was observed. The efficiency of this system relies on the precise conformational control of the substrate within the confined space of the host cage.
四氢-狄尔斯-阿尔德 (TDDA) 反应是一种有用的转化,可在单个合成步骤中从简单的线性前体快速组装多环支架。然而,该反应需要仔细的底物设计和苛刻的反应条件,以克服这种转化固有的熵成本。在此,我们报告了自组装 Pd 6 L 4笼内有效的位点选择性 TDDA 转化。尽管尺寸很大,但所使用的基板的灵活性允许在主体腔内进行有效的封装。发现封装客体的热环化速率大大提高,并且观察到对不对称基材的高产物选择性。该系统的效率依赖于宿主笼有限空间内底物的精确构象控制。
Copper-catalyzed nucleophilic trifluoromethylation of propargylic halides
Reactions of propargylic halides with trifluoromethyltrimethylsilane in the presence of a catalytic amount of copper(I) thiophene-2-carboxylate (CuTC) have been found to give the corresponding trifluoromethylated products in good to high yields with a high selectivity.