Synthesis of 2-Tetrazolyl-Substituted 3-Acylpyrroles via a Sequential Ugi-Azide/Ag-Catalyzed Oxidative Cycloisomerization Reaction
作者:Han-Han Kong、Hong-Ling Pan、Ming-Wu Ding
DOI:10.1021/acs.joc.8b01984
日期:2018.10.19
cascade cycloisomerization/aerobic oxidation reaction of a Ugi-azide adduct for the preparation of 3-acylpyrroles using molecular oxygen as the terminal oxidant has been developed. A series of 2-tetrazolyl-substituted 3-acylpyrroles were obtained in 62–89% yields from readily available enynals 1, primaryamines2, isocyanides 3, and trimethylsilyl azide 4 in the presence of a catalytic amount of AgNO3 and
Gold-Catalyzed Cascade Reactions of Furan-ynes with External Nucleophiles Consisting of a 1,2-Rearrangement: Straightforward Synthesis of Multi-Substituted Benzo[<i>b</i>]furans
作者:Ning Sun、Xin Xie、Yuanhong Liu
DOI:10.1002/chem.201400112
日期:2014.6.10
A gold‐catalyzed cycloisomerization of silyl‐protected 2‐(1‐alkynyl)‐2‐alken‐1‐(2‐furanyl)‐1‐ols with various nucleophiles including water, alcohol, aniline, sulfonamide, and electron‐rich arene has been developed. The method provides a highly efficient access to 5,7‐disubstituted or 2,5,7‐trisubstituted benzo[b]furans with a wide diversity of substituents under mild reaction conditions, which are
甲硅烷基保护的2-(1-炔基)-2-烯基-1-(2-呋喃基)-1-醇与各种亲核试剂(包括水,醇,苯胺,磺酰胺和富电子芳烃)的金催化环异构化反应已开发。该方法提供了以高效率的存取5,7-二取代的或2,5,7-三取代的苯并[ b ]呋喃与取代基的反应条件温和,这是不通过其他方法容易获得下一个广泛的多样性。值得注意的是,在环化过程中,烷基从呋喃环的C2到C3位置发生了有趣的重排。通过以下金辅助的烯丙基取代,可以在其C5位侧链上修饰具有广泛官能团的苯并[ b ]呋喃。
Application of Photochemical Decarbonylation of Cyclopropenones for the in Situ Generation of Reactive Enediynes. Construction of a Cyclopropenone-Containing Enediyne Precursor by Using a Cyclopropenone Acetal Building Block
作者:Andrei Poloukhtine、Vladimir V. Popik
DOI:10.1021/jo048065y
日期:2005.2.1
was prepared in 10 steps by sequential modification of the cyclopropenone 2,2-dimethyl-1,3-propanediyl acetal (5). The crucial cyclization step was achieved under Nozaki conditions, while the endocylic double bond has been introduced by the allylic rearrangement. UV irradiation of the cyclopropenone 1 results in efficient decarbonylation and the formation of the reactive enediyne 2. The latter undergoes
Phase-transfer-catalyzed cyclization reaction of nucleophilic addition to electron-deficient 1,3-conjugated enynes for the synthesis of functionalized 4H-pyrans
作者:Jie Hu、Lei Liu、Shangdong Yang、Yong-Min Liang
DOI:10.1039/c0ob01255f
日期:——
A variety of substituted 4H-pyrans are readily prepared in moderate to good yields under the mild reaction conditions by nucleophilic addition to electron-deficient 1,3-conjugated enynes with phase-transfer catalysis (PTC).
Phosphine-Mediated Regio- and Stereoselective Hydrocarboxylation of Enynes
作者:Wenbo Li、Junliang Zhang
DOI:10.1021/ol4031556
日期:2014.1.3
A phosphine-mediated regio- and stereoselective addition reaction of diverse nucleophiles to yne-enones leading to polysubstituted 1,3-diene scaffolds in moderate to good yields has been reported.