卤化铟(III)催化邻炔基苯酚的加氢烷氧基化反应,以高收率提供苯并[ b ]呋喃。反应的进行与5-内切-挖区域选择性与各种在芳烃官能酚类和以高产率使用的InI炔基部分3在DCE(5摩尔%)。实验和计算研究支持了基于炔烃的铟(III)π-路易斯酸活化,然后进行苯酚的亲核加成和最终的原金属脱金属,得到相应的苯并[ b ]呋喃的机理。DFT计算表明二聚体In 2 I 6 是通过与炔烃和羟基的新型双配位而催化的物质。
A concise approach for the synthesis of 3-iodoindoles and 3-iodobenzo[b]furans via Ph3P-catalyzed iodocyclization
作者:Yin-Long Li、Jian Li、Sheng-Nan Yu、Ji-Bo Wang、Yan-Min Yu、Jun Deng
DOI:10.1016/j.tet.2015.09.005
日期:2015.10
A variety of 3-iodoindole and 3-iodobenzo[b]furan derivatives were conveniently prepared from the corresponding 2-alkynylanilines and 2-alkynylphenols through Ph3P-catalyzed iodocyclization in the presence of N-iodosuccinimide (NIS). This protocol provides a rapid access to 3-iodoindoles and 3-iodobenzo[b]furans in good to excellent yields under mild conditions.
Cationic Palladium(II)-Catalyzed Synthesis of 2-Substituted 3-Hydroxymethylbenzo[b]furans
作者:Xiuling Han、Xiyan Lu、Huan Wang
DOI:10.1055/s-0030-1289519
日期:2011.10
tandem reaction involving an intramolecular oxypalladation of an alkyne and an addition to the carbonyl group to quench the carbon-palladium bond to complete the catalytic cycle was developed. The reaction was catalyzed with the cationic palladium(II) species without the necessity of a redox system. aldehyde - alkyne - cationic palladium(II) complex - 3-hydroxymethylbenzofuran - oxypalladation
Palladium-Catalyzed Aryl-Furanylation of Alkenes: Synthesis of Benzofuran-Containing 3,3-Disubstituted Oxindoles
作者:Hongbo Qi、Kaiming Han、Shufeng Chen
DOI:10.1021/acs.joc.1c00617
日期:2021.7.16
A novel palladium-catalyzed aryl-furanylation of alkenes is described. This protocol provided a straightforward route to the synthesis of various benzofuran-containing 3,3-disubstitutedoxindole derivatives bearing a quarternary carbon center. In the cascade process, one C(sp2)–O bond, two C(sp2)–C(sp3) bonds, an oxindole, and a furan ring are formed in a single chemical operation.
Gold-Catalyzed Enynal and Enynol Coupling by Selectively Steering Two Transient Vinyl-Gold Intermediates
作者:Zipeng Wang、Tongxiang Cao、Shifa Zhu
DOI:10.1021/acs.orglett.2c03890
日期:2022.12.23
bond is easily accessible but less exploited in homogeneous gold catalysis, which possesses weak nucleophilicity and would be likely to undergo protodemetalation. Herein, a gold-catalyzed enynal and enynol coupling by selectively steering two transient vinyl-gold intermediates is realized under mild conditions. It exhibits high atom economy and good tolerance of functional groups with the added benefit
and efficient tandem cyclization/sulfenylation of o-alkynyl-phenols/-anilines/enaminones for the synthesis of diverse sulfur-containing bisheterocycles has been developed using stable, odorless, and easy-to-handle elemental S8 as a building block under green chemistry conditions. Notably, a one-step simple base-mediated organic transformation affords a benzofuran (indole or chromone) ring and two C–S
使用稳定、无味且易于处理的元素 S 8作为构建块,开发了一种用于合成多种含硫双杂环的邻炔基苯酚/-苯胺/烯胺酮的方便有效的串联环化/亚磺酰化绿色化学条件。值得注意的是,一步简单的碱介导的有机转化提供了一个苯并呋喃(吲哚或色酮)环和两个 C-S 键。这种方法的吸引人的特点包括没有金属催化剂、温和的条件、良好的官能团耐受性和有价值的产品结构。