Nickel-Mediated Inter- and Intramolecular Reductive Cross-Coupling of Unactivated Alkyl Bromides and Aryl Iodides at Room Temperature
作者:Chang-Song Yan、Yu Peng、Xiao-Bo Xu、Ya-Wen Wang
DOI:10.1002/chem.201200190
日期:2012.5.7
A nickel‐mediated intermolecular reductivecross‐coupling reaction of unactivated alkyl bromides and aryl iodides at room temperature has been developed and successfully extended to less explored intramolecular versions and tandem cyclization‐intermolecular cross‐coupling. Highly stereoselective (or stereospecific) synthesis of linear‐fused perhydrofuro[2,3‐b]furan (pyran) and spiroketal skeletons
已开发出室温下未活化的烷基溴和芳基碘的镍介导的分子间还原性交叉偶联反应,并成功地扩展到较少探索的分子内版本和串联环化-分子间交叉偶联。线性稠合的全氢呋喃[2,3- b ]呋喃(吡喃)和螺环骨架的高度立体选择性(或立体定向)合成可以快速获得这些有用的结构单元,这在相关天然产物的合成中可能具有潜在的价值。给出了形成连续立体中心的合理解释。
Preparation of Vinylogous 2-Sulfonylindolines by the Palladium-Catalyzed Heteroannulation of <i>o</i>-Iodoanilines with Dienyl Sulfones and Their Further Transformation to Indoles and Carbazoles
作者:Thomas G. Back、Richard J. Bethell、Masood Parvez、Jerry A. Taylor
DOI:10.1021/jo016080m
日期:2001.12.1
employed as dienes in Diels-Alder reactions with dimethyl acetylenedicarboxylate (DMAD), methyl propiolate, or methyl acrylate. In the case of the latter two dienophiles, the cycloadditions were highly regioselective, affording the corresponding 1,3-products (with respect to the relative positions of the sulfone and ester groups), exclusively. The cycloadducts from acetylenic dienophiles were converted to
The SmI2âH2Oâamine mixture has been shown to be effective for intramolecular couplings providing diastereoselectivities of up to 100% de in the coupling of O-cyclohexenyliodophenol derivatives into heterocycles.
Fully deprotected phosphonamidatedipeptides, predicted as effective inhibitors of cytosolic leucine aminopeptidase, showed unexpected instability in water solution at pH below 12. Their hydrolysis rate was strictly correlated with basicity of the N-terminal amino group. To improve this feature a phosphonamidate analogue containing less basic, aromatic 2-aminophenylphosphonate residue in P1 position
Oxidative Route to Indoles via Intramolecular Amino-Hydroxylation of <i>o</i>-Allenyl Anilines
作者:Nicholas R. Lauta、Ryan E. Williams、David T. Smith、Vlad K. Kumirov、Jon T. Njardarson
DOI:10.1021/acs.joc.1c01379
日期:2021.8.6
A new intramolecularoxidative amino-hydroxylation of o-allenyl anilines is reported. Treatment of carbamate-protected anilines with lead(IV) carboxylates in dichloromethane at room temperature results in facile tandem C–N (allene cyclization) and C–O bond formation (carboxylate trapping) to form indole products. Detailed reaction scope, mechanistic and kinetic studies suggest a reaction pathway involving