Dibenzo[b,e]azepin-6-ones and Seven-Membered Sultam Derivatives: Convenient Synthesis via Palladium-Catalyzed Regioselective Intramolecular Heck Reaction and Application towards Drug-Like Small Molecules
作者:Arijit Das、Arup Maiti、Mrinalkanti Kundu、Kuldeep K. Roy、Inul Ansary
DOI:10.1055/s-0037-1611548
日期:2019.9
modeling studies were performed to investigate the binding potential to muscarinic acetylcholine receptor (M4). A new, convenient synthesis of dibenzo[b,e]azepin-6-ones and seven-membered sultam derivatives have been envisaged via Pd-catalyzed regioselective intramolecular Heckreaction of the corresponding easily accessible precursors. This protocol has been successfully implemented to synthesize N-methyldarenzepine
抽象的 已经设想了通过相应易得的前体的Pd催化的区域选择性分子内Heck反应,来合成新的,方便的二苯并[ b ] ,[ e ] azepin-6-ones和七元sultam衍生物。该方案已成功实施,可通过四个步骤以高收率合成N-甲基达伦西平。此外,其中一种中间体已被用于合成达伦西平的新类似物。进行了初步建模研究,以研究与毒蕈碱型乙酰胆碱受体(M4)的结合潜力。 已经设想了通过相应易得的前体的Pd催化的区域选择性分子内Heck反应,来合成新的,方便的二苯并[ b ] ,[ e ] azepin-6-ones和七元sultam衍生物。该方案已成功实施,可通过四个步骤以高收率合成N-甲基达伦西平。此外,其中一种中间体已被用于合成达伦西平的新类似物。进行了初步建模研究,以研究与毒蕈碱型乙酰胆碱受体(M4)的结合潜力。
Aniline‐Type Hypervalent Iodine(III) for Intramolecular Cyclization via C−H Bond Abstraction of Hydrocarbons Containing N‐ and O‐Nucleophiles
作者:Yuna Nishiguchi、Katsuhiko Moriyama
DOI:10.1002/adsc.202100316
日期:2021.7
We developed a method for the preparation of (diacetoxyiodo)-2-(N-alkylamido)benzene as an aniline-type hypervalent iodine(III). We also achieved direct cyclizations via C−H bond abstraction, such as the Hofmann-Löffler-Freytag reaction, a direct amination, and a direct lactonization, using the aniline-type hypervalent iodine(III) to obtain corresponding products in high yields.
A Highly Efficient Copper-Catalyzed Method for the Synthesis of 2-Hydroxybenzamides in Water
作者:Sangit Kumar、Shah Balkrishna
DOI:10.1055/s-0031-1289755
日期:2012.5
which may facilitate the hydroxylation in water. Overall, the first report on copper-catalyzed hydroxylation reaction in water and first catalytic route for the synthesis of 2-hydroxybenzamides is presented. Simple purification procedure and convenience of employing low-cost reagents in neat water make this method practical and economical for the synthesis of 2-hydroxybenzamides. An efficient copper-catalyzed
A palladium-catalyzed domino Larock annulation/dearomative Heckreaction is developed, which delivers a range of tetracyclic indoline derivatives in moderate to excellent yields through a Larock annulation of N-bromobenzoyl o-iodoanilines with alkynes and a subsequent intramolecular dearomative Heckreaction. This protocol provides a straightforward route to structurally diverse indolines from readily
Dibrominative Spirocyclization of 2-Butynolyl Anilides: Synthesis of <i>gem</i>-Dibromospirocyclic Benzo[<i>d</i>][1,3]oxazines and Their Application in the Synthesis of 4<i>H</i>-Furo[3,2-<i>b</i>]indoles
The combination of catalytic aqueous hydrochloricacid (HCl) and N-bromosuccinimide (NBS) generated electrophilic brominemonochloride (BrCl), which readily induced spiroannulation of 2-alkynolyl anilides (n = 1–3) to form gem-dibromospirocyclic benzo[d][1,3]oxazines in up to 92% yield. The reaction occurred under mild and metal-free conditions using EtOAc as a green solvent. The resulted spirocyclic
催化盐酸水溶液(HCl)和N-溴代琥珀酰亚胺(NBS)的结合产生亲电的一氯化溴(BrCl),该溶液很容易诱导2-炔基苯甲酰胺(n = 1-3)的螺环化反应,形成宝石-二溴螺环苯并[ d ] [1,3]恶嗪的产率高达92%。反应在温和且无金属的条件下进行,使用EtOAc作为绿色溶剂。所得的螺环产物包含苯并[ d ] [1,3]恶嗪,其既可以用作药效基团,也可以用作合成前体。此外,当前协议允许毫不费力地引入sp 3 - gem-二溴碳与空间要求很高的螺环中心相邻。这些螺旋杂环(n = 1)被证明具有通用性,并且操作方便。这些螺环的碱促进的脱溴化芳构化以极好的收率掩盖了稀有的和合成上有用的2-芳基-3-溴呋喃。这些3-溴呋喃是分子内Ullmann C–N键偶合以构建难以制备的4 H -furo [3,2- b ]吲哚的合适底物。另外,当前的方案是灵活的并且可适应于制备宝石-二氯化物变体。