报道了 1,2-炔二酮的一般亲电碘环化/亲核试剂加成级联转化,用于合成各种氧杂环和获得区域选择性炔烃羟基化。呋喃束缚的炔二酮通过羰基-炔烃环化引发的杂芳烃脱芳构化作用构建外烯醇醚,而其他(杂)芳烃、烯基和烷基束缚的炔二酮导致形成高度官能化的 3(2 H ))-呋喃酮。重要的是,开发的多米诺骨牌协议涉及重要的杂环支架的构建和在单个操作中安装两个功能组。此外,使用水作为亲核试剂通过呋喃酮开环导致区域选择性炔烃羟基化。开发的协议的特点是底物范围广泛,并且它们的实用性已通过许多合成后转换得到证明。
Hydrogen-Bonding Activation of Gold(I) Chloride Complexes: Enantioselective Synthesis of 3(2H)-Furanones by a Cycloisomerization-Addition Cascade
作者:Pilar Elías-Rodríguez、Manuel Benítez、Javier Iglesias-Sigüenza、Elena Díez、Rosario Fernández、José M. Lassaletta、David Monge
DOI:10.1021/acs.orglett.4c02091
日期:2024.7.19
Enantioselective synthesis of 3(2H)-furanones has been achieved using the intermolecular H-bonding activation of gold(I) chloride complexes. A DM-BINAP [(R)-(+)-2,2′-Bis[di(3,5-xylyl)phoshino]-1,1′-binaphthyl] digold(I) dichloride complex in combination with a sulfonyl squaramide (SO2Sq) has been identified as the optimal catalytic system. The process involves a 5-endo-dig oxa-cyclization followed
利用氯化金 (I) 络合物的分子间氢键活化实现了 3(2 H )-呋喃酮的对映选择性合成。 DM-BINAP [( R )-(+)-2,2′-双[二(3,5-二甲苯基)膦]-1,1′-联萘]二氯化金(I)络合物与磺酰方酰胺的组合(SO 2 Sq)已被确定为最佳催化体系。该过程涉及 5-内-地物氧杂环化,然后立体控制地添加吲哚。有趣的是,通过氢键的软 L*Au-Cl 活化允许在色谱纯化后回收 L*Au-Cl 和活化剂。
Synthetic Transformations of Higher Terpenoids. 45#. Regioselective Synthesis of 5-Labdanoid-Substituted Pyrazoles and Assessment of Their Analgesic Activity
作者:M. E. Mironov、A. I. Poltanovich、V. I. Krasnov、T. V. Rybalova、S. A. Borisov、T. G. Tolstikova、E. E. Shults
DOI:10.1007/s10600-024-04408-1
日期:2024.7
A method for targeted structural modification of the methyl ester of phlomisoic acid was developed by introduction of an additional C-16 ketopyrazole moiety via cyclocondensation of diterpenoid alkyne-1,2- diones with arylhydrazines. The conditions for regioselective formation of labdanoid 1,3-diarylpyrazol-5- ylmethanones were found. The possibility of a sequential four-component reaction in a single