在本文中,我们描述了三氟甲磺酸银/对甲苯磺酸共催化合成17个异香豆素和两个由2-炔基苯甲酸酯和3-炔基噻吩-2-羧酸酯组成的噻吩并[2,3 - c ]吡喃-7-,分别。反应在温和的反应条件下和低的催化剂载量下以绝对的区域选择性进行,以良好至极好的收率提供所需的产物。提出了一种可能的反应机理,并得到了同位素交换试验,1 H NMR研究和特别实验的支持。
Isatogens. Part VI. Synthesis of isatogens via tolan (diphenylacetylene) intermediates
作者:C. C. Bond、M. Hooper
DOI:10.1039/j39690002453
日期:——
A number of substituted 2-nitrotolans and isatogens have been prepared in high yield from copper(I) 2-nitrophenylacetylide and substituted aromatic iodo-compounds. The reaction has been shown to be affected by both electronic and steric factors and its limitations are discussed. 2-Carbamoyltolans have been shown to cyclise to aminoindenones. A number of novel compounds have been isolated from these
In Situ Formation of RSCl/ArSeCl and Their Application to the Synthesis of 4-Chalcogenylisocumarins/Pyrones from <i>o</i>-(1-Alkynyl)benzoates and (<i>Z</i>)-2-Alken-4-ynoates
作者:Linlin Xing、Yong Zhang、Bing Li、Yunfei Du
DOI:10.1021/acs.orglett.9b01046
日期:2019.5.17
diorganyl disulfides or diselenides with PhICl2 in acetonitrile was found for the first time to lead to the in situ formation of organosulfenyl chloride or selenenyl chloride, which enables the regioselective intramolecular chalcogenylacyloxylation of alkynes resulting in the formation of 4-chalcogenylisocumarins/pyrones in good to excellent yields under metal-free conditions.