报道了一种新颖的钯催化脱羧级联环化反应,该反应通过使用α-氧代羧酸作为三碳插入单元来组装各种稠合的杂多环。该方案可通过使用不同的芳基碘化物(包括烯烃系的2-碘代苯甲酰胺和2-(2-碘代苯基)-)以中等到良好的产率合成异喹啉二酮和吲哚并[2,1 - a ]异喹啉酮稠合的苯并环庚酮1 H-吲哚。值得注意的是,该方法通过依次进行分子内碳氢合,CH活化和脱羧,实现了六元环和七元环的同时构建。
Provided is a novel therapeutic means for Alzheimer's disease. In particular, provided is a compound represented by the following general formula (I):
[wherein Ar
1
represents 2-methoxy-4-(2-pyridylmethoxy)phenyl etc. and Ar
2
represents a 1H-indol-6-yl group etc.] or a salt thereof.
Norbornene Derivatives-Controlled Palladium-Catalyzed Divergent Synthesis of Dibenzo[<i>a</i>,<i>c</i>]cycloheptenones and Fluorenones from Aryl Iodides and α-Oxocarboxylic Acids
作者:Liwei Zhou、Pengyang Jing、Zhiwei Li、Rui Liu、Jiannan Chen、Guobo Deng、Yun Liang、Yuan Yang
DOI:10.1021/acs.orglett.3c04065
日期:2024.1.26
A palladium-catalyzed divergent cascade decarboxylative annulation of aryliodides and α-oxocarboxylic acids using norbornene (NBE) derivatives as a controlled switch is reported. When NBE is used as a mediator, fluorenones are synthesized with moderate to excellent yields via a Catellani reaction that involves sequential ortho-C–H arylation and ipso-decarboxylative acylation of aryliodides. Employing
据报道,使用降冰片烯(NBE)衍生物作为受控开关,钯催化芳基碘化物和α-氧代羧酸的发散级联脱羧成环。当 NBE 用作介体时,通过 Catellani 反应以中等至优异的产率合成芴酮,该反应涉及芳基碘化物的连续邻位-C–H 芳基化和本身脱羧酰化。使用氧杂降冰片二烯 (ONBD) 代替 NBE 可以通过逆狄尔斯-阿尔德反应组装二苯并[ a , c ]环庚烯酮,而不是释放 ONBD。此外,该方法的合成效用通过产品的多样化得到证明。
Carbene‐Catalyzed and Pnictogen Bond‐Assisted Access to PIII‐Stereogenic Compounds
作者:Jianjian Liu、Rui Deng、Xuyang Liang、Mali Zhou、Pengcheng Zheng、Yonggui Robin Chi
DOI:10.1002/anie.202404477
日期:2024.7.8
carbene catalysis was developed. The Lewis acidic P center simultaneously activate the bonded formyl group and stabilize the conformation of Breslow intermediates, it may help to achieve high stereo and regio-selectivities. Following the oxidation of the Breslow intermediate, nucleophile facilitates recycling of NHC to generate enantioenriched trivalentphosphorus compounds.
开发了一种结合分子内 PnB 相互作用和卡宾催化不对称合成手性 P III化合物的催化方法。 Lewis酸性P中心同时激活键合的甲酰基并稳定Breslow中间体的构象,可能有助于实现高立体和区域选择性。 Breslow 中间体氧化后,亲核试剂促进 NHC 的再循环,生成对映体富集的三价磷化合物。
Atmosphere-Controlled Palladium-Catalyzed Divergent Decarboxylative Cyclization of 2-Iodobiphenyls and α-Oxocarboxylic Acids