Unexpected iron(iii) chloride-catalysed dimerisation of 1,1,3-trisubstituted-prop-2-yn-1-ols as an expedient route to highly conjugated indenes
作者:Weidong Rao、Philip Wai Hong Chan
DOI:10.1039/c003522j
日期:——
A method to prepare highly conjugated indenes efficiently by iron(III) chloride-catalysed dimerisation of trisubstituted propargylic alcohols under very mild conditions at room temperature is described. The reactions are rapid and operationally straightforward, giving the indene products in good yields and regioselectivity.
On the Distribution of Linear versus Angular Naphthalenes in Aromatic Tetradehydro-Diels-Alder Reactions - Effect of Linker Structure and Steric Bulk
作者:Bhavani Shankar Chinta、Beeraiah Baire
DOI:10.1002/ejoc.201700588
日期:2017.6.23
We report here a systematic study on the aromatic tetradehydro Diels-Alder (Ar-TDDA) reaction to understand the factors which may play key role on the distribution of linear and angular naphthalene products. Two factors such as nature of structure of the linker and steric bulk of the substituent on the enyne part have been studied. It is found that the structure of the linker has tremendous role on
Synthesis of Substituted Thiophenes through Dehydration and Heterocyclization of Alkynols
作者:Jian Li、Yang Liu、Zebin Chen、Jiaming Li、Xiaoliang Ji、Lu Chen、Yubing Huang、Qiang Liu、Yibiao Li
DOI:10.1021/acs.joc.1c03114
日期:2022.3.4
described for obtaining a variety of substituted thiophenes with functional potential via metal-free dehydration and sulfur cyclization of alkynols with elementalsulfur (S8) or EtOCS2K in moderate-to-good yields. The method provides the base-free generation of a trisulfurradicalanion (S3•–) and its addition to alkynes as an initiator. This research broadens the applications of S3•– in the synthesis
描述了一种方案,用于通过无金属脱水和硫环化炔醇与元素硫 (S 8 ) 或 EtOCS 2 K 以中等至良好的产率获得各种具有功能潜力的取代噻吩。该方法提供了无碱生成三硫自由基阴离子 (S 3 •– ) 并将其添加到炔烃中作为引发剂。本研究拓宽了S 3 •–在含硫杂环合成中的应用。
Visible-light-mediated photocatalytic cross-coupling of acetenyl ketones with benzyl trifluoroborate
作者:Lingchun Zhang、Yanle Chu、Peizhi Ma、Shujuan Zhao、Qiaoyan Li、Boya Chen、Xuejiao Hong、Jun Sun
DOI:10.1039/c9ob02624j
日期:——
In this report, we describe a simple visible light-triggered Barbier-type reaction by employing acetenyl ketones with benzyl trifluoroborates. Through a radical-radical cross-coupling process, this photocatalytic protocol furnished a wide range of tertiary propargyl alcohols. Mechanistic investigation indicated that proton-coupled electron transfer (PCET) might be involved in the photochemical transformations