开发了一种无过渡金属碱催化的 2-炔基酚分子内环化,用于简便合成 2-取代的苯并[ b ]呋喃。使用容易获得的 Cs 2 CO 3作为催化剂,在温和的反应条件下,可以以良好至优异的收率获得各种 2-芳基和 2-烷基取代的苯并[ b ]呋喃。广泛的底物范围和克级高效效率的典型维持使该协议成为合成 2-取代苯并[ b ]呋喃衍生物的潜在实用方法。
A Facile Construction of Bisheterocyclic Methane Scaffolds through
<scp>Palladium‐Catalyzed</scp>
Domino Cyclization
作者:Hongbo Qi、Kaiming Han、Shufeng Chen
DOI:10.1002/cjoc.202100242
日期:2021.10
A convenient palladium-catalyzed domino cyclization reaction for the construction of bis(benzofuranyl)methanescaffolds bearing an all-carbon quaternary center has been described. In the cascade process, one C(sp2)—O bond, two C(sp2)—C(sp3) bonds as well as two benzofuran rings are formed in a single synthetic sequence. The approach shows wide scope of substrates and good functional-group tolerance
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
Herein, we report a straightforward three-component synthesis of novel dioxaphosphorane-fused diphosphacycles with distinctive photophysical properties. Based on their unique structure and properties, a novel fluorescent switch for pH sensing was revealed by a dynamic ring-opening/ring-closing mechanism.