Gold(I)-Catalyzed Intermolecular [2+2] Cycloaddition of Alkynes with Alkenes
作者:Verónica López-Carrillo、Antonio M. Echavarren
DOI:10.1021/ja104177w
日期:2010.7.14
The gold(I)-catalyzedintermolecular reaction of terminal alkynes with alkenes leads to cyclobutenes. The use of sterically hindered cationic Au(I) complexes as catalysts is key for the success of this reaction.
Base‐Mediated Radical Borylation of Alkyl Sulfones
作者:Mingming Huang、Jiefeng Hu、Ivo Krummenacher、Alexandra Friedrich、Holger Braunschweig、Stephen A. Westcott、Udo Radius、Todd B. Marder
DOI:10.1002/chem.202103866
日期:2022.1.13
The utilization of inactivated alkyl sulfones as alkylradical precursors in a base-mediated borylation reaction with B2neop2 is reported, allowing direct access to valuable alkyl boronate esters without further transesterification. This approach is scalable and is tolerant to a variety of functional groups and substrates including complex molecules.
据报道,在与 B 2 neop 2的碱介导的硼基化反应中,利用失活的烷基砜作为烷基自由基前体,从而无需进一步酯交换即可直接获得有价值的烷基硼酸酯。这种方法具有可扩展性,并且能够耐受各种官能团和底物,包括复杂分子。
Manganese(III)-Promoted Tandem Oxidation and Cyclization of β-Keto Ester Derivatives of Terpenoids
作者:Zhilong Li、Heejung Jung、Mira Park、Myoung Soo Lah、Sangho Koo
DOI:10.1002/adsc.201100215
日期:2011.8
A new type of terpenoid cyclization directed by a β-keto ester moiety has been developed, which proceeded by manganese(III)-initiated oxidation of the β-keto ester, followed by an intramolecular hetero Diels–Alder reaction with the terpenoid chain. This reaction produces polycyclic dihydropyrans in high yields and stereoselectivities under mild conditions.
Identification and synthesis of (Z)-(1′S,3′R,4′S)(–)-2-(3′,4′-epoxy-4′-methylcyclohexyl)-6-methylhepta-2,5-diene, the sex pheromone of the southern green stinkbug, Nezara viridula(L.)
作者:Raymond Baker、Miguel Borges、Nigel G. Cooke、Richard H. Herbert
DOI:10.1039/c39870000414
日期:——
The sexpheromone of the male greenstinkbug, Nezaraviridula(L.) has been shown to be a novel epoxybisabolene (Z)-(1′S,3′R,4′S)(–)-2-(3′,4′-epoxy-4′-methylcyclohexyl)-6-methylhepta-2,5-diene, whose structure has been confirmed by spectroscopic studies and synthesis of the eight possible stereoisomers.
Iodine-induced cyclization of γ,δ-unsaturatedsecondarythioamides 1 proceeded regio- (5-exo-trigonal) and chemo- (sulfur-carbon bond formation) selectively, providing iminothiolactones 2, which were converted in two-step sequences (dehydroiodination and N-acetylation) into 2-acetoamidothiophenes 4. This procedure was performed in one flask to afford polysubstituted 2-aminothiophenes.