Cross-Coupling Reaction of α-Chloroketones and Organotin Enolates Catalyzed by Zinc Halides for Synthesis of γ-Diketones
作者:Makoto Yasuda、Shoki Tsuji、Yusuke Shigeyoshi、Akio Baba
DOI:10.1021/ja0258172
日期:2002.6.1
catalyzed by zinc halides. In contrast to the exclusive formation of 1,4-diketones 3 under catalytic conditions, uncatalyzed reaction of 1 with 2 gave aldol-type products 4 through carbonyl attack. NMR study indicates that the catalyzed reaction includes precondensation between tin enolates and α-haloketones providing an aldol-type species and their rearrangement of the oxoalkyl group with leaving halogen
enantioselective catalytic kinetic resolution of allylic alcohols through asymmetric isomerization with chiralBINOL derivatives-based alkoxides as bifunctional Brønsted base catalysts were described in the study. A number of chiralBINOL derivatives-based alkoxides were synthesized, and their structure-enantioselectivity correlation study in asymmetric isomerization identified a promising chiral Brønsted
Cationradicals of enamines, generated by the oxidation with CeIV compounds, react with electron-rich olefins to give the addition products. The formal α-alkylation of formylacetate is realized by the reaction of 3-(1-pyrrolidinyl)propenoate and olefins by the use of tetrabutylammonium cerium(IV) nitrate as an oxidant.
The cross-coupling reaction of dianion cuprates, generated from ketone α,β-dianions and copper salts, with acid chlorides, was studied. The reaction gave good to moderate yields of unsymmetrical 1,4-diketones. The consecutive treatment of a dianion cuprate with cyclohexanecarbonyl chloride and methyl iodide or two different acid chlorides gave 2-methyl-substituted 1,4-diketone or triketone, respectively
versatile 1,4-diketones are smoothly generated under metal-free and external-reductant-free electrolytic conditions. Moreover, the tolerance of various functional groups and decagram-scale experiments have shown the practicability and potential applications of this methodology. Moreover, a range of heterocyclic compounds were easily prepared through follow-up procedures of 1,4-diketones.
已经报道了在未分割的电池中有效氢化不饱和 C C 键的简单电化学方案。在无金属和无外部还原剂的电解条件下顺利生成一系列多功能的1,4-二酮。此外,各种官能团的耐受性和十克规模的实验表明了该方法的实用性和潜在应用。此外,通过1,4-二酮的后续程序可以轻松制备一系列杂环化合物。