A condition-controlled strategy for selectively synthesis of 2-acylbenzothiazoles and bibenzo[b][1,4]thiazines from aryl methyl ketones and disulfanediyldianilines was realized using I2/DMSO or I2/MeCN systems, respectively. The desired products were synthesized in only 15 min with moderate to excellent yields (50%-90%) under microwave-assisted, metal-free conditions. The strategy provides a great
分别使用 I 2 /DMSO 或 I 2 /MeCN 系统实现了从芳基甲基酮和二硫烷二基二苯胺选择性合成 2-酰基苯并噻唑和联苯[ b ][1,4]噻嗪的条件控制策略。在微波辅助、无金属条件下,所需产物仅在 15 分钟内合成,产率中等至极好(50%-90%)。该策略为苯并噻唑和双苯并噻嗪杂环化合物的有效合成中的选择性合成应用提供了巨大优势。
Selective C(sp<sup>2</sup>)–H bond functionalization of olefins <i>via</i> visible-light-induced photoredox-quinuclidine dual catalysis
作者:Xin-Tao Gu、Long-Hai Li、Yin Wei、Min Shi
DOI:10.1039/d2cc03694k
日期:——
The siteselective C(sp2)–H bond functionalization of olefins has been achieved through a visible-light-induced photoredox-quinuclidine dualcatalysis upon merging the quinuclidinium radical cation addition to alkene strategy and the distal heteroaryl ipso-migration strategy. This synthetic protocol features a simple operation with readily available starting materials in good step-economy to access
A Regel-type transition-metal-free direct C-2 aroylation of (benzo)oxazoles, (benzo)thiazoles and 1,3,4-oxadiazoles with acid chlorides catalyzed by N,N-dimethyl-4-aminopyridine (DMAP) is described. This methodology is effective with several aroyl and heteroaroyl chlorides affording the corresponding 2-ketoazoles in moderate to excellent yields.
Synthesis of 2-Acylbenzothiazoles via the Cu(OTf)2-Catalyzed Tandem Reaction of β,β-Dihalidestyrenes with 2,2′-Disulfanediyldianilines
A new method has been developed for the one-pot construction of 2-acylbenzothiazoles via the Cu(OTf)(2)-catalyzed tandem reaction of ,-dihalidestyrenes with 2,2-disulfane-diyldianilines. A variety of different dihalidestyrenes and diphenyldisulfanes were efficiently converted into the corresponding 2-acylbenzothiszole derivatives in the presence of Cu(OTf)(2). Most importantly, this protocol allowed for the long chain 1,1-dibromohept-1-ene to be converted into the corresponding 2-hexylbenzo[d]thiazole in moderate yield.