Lewis Acid Catalyzed Tandem 1,4-Conjugate Addition/Cyclization of in Situ Generated Alkynyl <i>o</i>-Quinone Methides and Electron-Rich Phenols: Synthesis of Dioxabicyclo[3.3.1]nonane Skeletons
作者:Ji-Yuan Du、Yan-Hua Ma、Fan-Xiao Meng、Bao-Li Chen、Shao-Liang Zhang、Qian-Li Li、Shu-Wen Gong、Da-Qi Wang、Chun-Lin Ma
DOI:10.1021/acs.orglett.8b01862
日期:2018.7.20
A versatile Lewis acid catalyzed tandem cyclization of in situgenerated alkynyl o-quinone methides (o-AQMs) with electron-rich phenols has been developed on the basis of the mode involving an intermolecular 1,4-conjugate addition/6-endo cyclization/1,3-aryl shift/intramolecular 1,4-conjugate addition cascade. This reaction provides a new method for expeditious assembly of synthetically and biologically
Metal-Free One-Pot Synthesis of 3-Phosphinoylbenzofurans via Phospha-Michael Addition/Cyclization of H-Phosphine Oxides and <i>in Situ</i> Generated <i>ortho-</i>Quinone Methides
A novel metal-free one-pot protocol for the effective and efficient synthesis of 3-phosphinoylbenzofurans via a phospha-Michael addition/cyclization of H-phosphine oxides and in situ generated ortho-quinone methides is described. Based on the expeditious construction of C(sp2)–P bonds, asymmetricsynthesis of optically pure 3-phosphinoylbenzofurans containing chiral P-stereogenic center has also been
描述了一种新颖的无金属一锅方案,该方案通过H-膦氧化物的磷化-迈克尔加成/环化作用和原位生成的邻醌甲基化物来有效和高效地合成3-膦酰基苯并呋喃。基于C(sp 2)-P键的快速构建,还通过使用手性R P -(-)-薄荷基苯基膦氧化物探索了含手性P-立体异构中心的光学纯3-膦酰基苯并呋喃的不对称合成。
Synthesis of Sulfonylated Heterocycles via Copper‐Catalyzed Heteroaromatization/Sulfonyl Transfer of Propargylic Alcohols
作者:Xinyi Chen、Andrey Shatskiy、Jian‐Quan Liu、Markus D. Kärkäs、Xiang‐Shan Wang
DOI:10.1002/asia.202001126
日期:2021.1.4
An unprecedented copper‐catalyzed heteroaromatization/sulfonyl transfer of propargylicalcohols with isocyanide has been developed. 3‐Sulfonyl benzofurans and indoles were produced under Cu(I) catalysis in good to high yields. The developed catalytic methodology provides controlled, modular, and facile access to sulfonyl benzoheterocycle scaffolds.
Cu(OAc)<sub>2</sub>·H<sub>2</sub>O-Promoted Tandem β-Alkynyl Elimination of α- or β-Hydroxy Propargylic Alcohols and Homocoupling of the Resulting Alkynyl Species
作者:Xiangsheng Xu、Zhenyong Huang、Yanfeng Lu
DOI:10.3184/174751913x13739011239995
日期:2013.9
α or β-hydroxy propargylic alcohols undergo tandem C(sp)–C(sp3) bondcleavage via β-alkynyl elimination and homo-coupling of the resulted alkynyl species in the presence of Cu(OAc)2·H2O to produce the corresponding hydroxycarbonyl compounds and 1,3-butadiynes.
One Pot Synthesis of γ-Benzopyranones via Iron-Catalyzed Aerobic Oxidation and Subsequent 4-Dimethylaminopyridine Catalyzed 6-<i>endo</i>
Cyclization
作者:Di Zhai、Lingzhu Chen、Minqiang Jia、Shengming Ma
DOI:10.1002/adsc.201700993
日期:2018.1.4
One-potsynthesis of γ-benzopyranones was realized in decent yields and excellent regioselectivities via iron-catalyzed aerobic oxidation and 4-dimethylaminopyridine-catalyzed cyclization of related propargylic alcohols. Derivatizations to aromatic substituted γ-benzopyranones and synthesis of naturally occurring 3′,4′-dimethoxyflavone have also been realized.