Intramolecular Heck reaction of methylenephthalimidine derivatives: a simple route to lennoxamine and chilenine
摘要:
A new concise route to the key intermediate for isoindolobenazepine alkaloids, lennoxamine and chilenine, was developed using amine and keto-ester condensation followed by Heck reaction. (C) 2003 Elsevier Ltd. All riellts reserved.
An electrochemical oxidative regio- and stereo-selective thio(seleno)cyanation of enamides has been developed to access (E)-β-thio(seleno)cyanated enamide compounds under environmentally-benign conditions without metal and exogenous oxidant in an undivided cell. The protocol features good reaction efficiency and functional group tolerance, providing a sustainable pathway for the thio(seleno)cyanation
已开发出一种电化学氧化区域选择性和立体选择性烯酰胺硫(硒)氰化反应,以在环境友好的条件下在未分裂的电池中获得 ( E )-β-硫代(硒)氰化烯酰胺化合物,而无需金属和外源氧化剂。该协议具有良好的反应效率和官能团耐受性,为烯酰胺的硫(硒)氰化提供了一条可持续的途径。通过改变卤化物取代基的位置制备六元和七元杂环的分子内交叉偶联反应进一步证明了该协议的实用性。机理研究表明,该反应可以通过[1,5]-H σ 重排进行,以实现独有的E立体选择性。
Different Lewis Acid Promotor-Steered Highly Regioselective Phosphorylation of Tertiary Enamides
Different Lewisacid promotor-steered highly regioselective phosphorylation of tertiary enamides with diverse H-phosphonates or H-phosphine oxides was developed. Under the catalysis of iron salt, the phosphonyl group was introduced into the α-position of tertiary enamides, affording various α-phosphorylated amides in high efficiency. On the other hand, the β-phosphorylated tertiary enamides were efficiently
An efficient and concise copper(I) bromide-mediated stereoselective β-sulfonylation of tertiary enamides with sulfonyl chlorides was achieved. This reaction proceeds smoothly with absolute E-selectivity and affords a range of (E)-β-amidovinyl sulfones bearing manifold functional groups in good yields. Moreover, this protocol features simple operation, excellent functional group tolerance and easy availability
实现了叔烯酰胺与磺酰氯的高效且简明的溴化铜 (I) 介导的立体选择性 β-磺酰化。该反应以绝对E选择性顺利进行,并以良好的产率提供一系列带有多种官能团的 ( E )-β-氨基乙烯基砜。此外,该协议还具有操作简单、功能组耐受性好和原材料易得等特点。机理实验表明直接磺酰化可能以自由基途径进行。
Heck−Suzuki−Miyaura Domino Reactions Involving Ynamides. An Efficient Access to 3-(Arylmethylene)isoindolinones
Substituted 3-(arylmethylene)isoindolin-1-ones can be efficiently synthesized in a stereoselective manner from various ynamides and boronic acids by palladium-catalyzed Heck-Suzuki-Miyaura domino reactions.