Three-Component Synthesis of Ynediones by a Glyoxylation/Stephens-Castro Coupling Sequence
作者:Eugen Merkul、Janis Dohe、Charlotte Gers、Frank Rominger、Thomas J. J. Müller
DOI:10.1002/anie.201007194
日期:2011.3.21
two steps forward! Starting from diverse heterocycles, the title reaction furnishes ynediones under very mild conditions in a direct and preparatively simple one‐pot process. The key to avoiding decarbonylation is the CuI‐catalyzed Stephens–Castro alkynylation rather than the usually more efficient Sonogashira coupling. In addition, novel highly atom‐economical four‐component syntheses of various heterocycles
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。