A practicalsynthesis of β-carbonylphenyltetrazolesulfones, useful for a series of enantioselective reactions, is shown. Aryl, alkyl and ester carbonyl compounds all proved to be efficiently synthesised, leading to products in up to >99 % yield over two steps. During this procedure, no special attention to conditions or laborious purification by chromatography is needed. Furthermore, X-ray crystallography
显示了可用于一系列对映选择性反应的 β-羰基苯基四唑砜的实际合成。芳基、烷基和酯羰基化合物都被证明是有效合成的,两步生成的产物产率高达 >99%。在此过程中,不需要特别注意条件或通过色谱法进行费力的纯化。此外,X 射线晶体学、动力学研究以及 NMR 和 IR 研究提供了对这些化合物在有机催化中的反应性的深入了解。
Transition-Metal-Free Formal Sonogashira Coupling and α-Carbonyl Arylation Reactions
作者:Birgit Prüger、Gretchen E. Hofmeister、Christian Borch Jacobsen、David G. Alberg、Martin Nielsen、Karl Anker Jørgensen
DOI:10.1002/chem.200902911
日期:2010.3.22
Sonogashira coupling and α‐carbonyl arylation reactions have been developed. These transformations are based on the nucleophilic aromatic substitution (SNAr) of β‐carbonyl sulfones to electron‐deficient aryl fluorides, producing a key intermediate that, depending on the reaction conditions, gives the aromatic alkynes or α‐aryl carbonyl compounds. The development of these reactions is presented and, based
Catalytic Asymmetric 1,2-Difunctionalization of Indolenines with α-(Benzothiazol-2-ylsulfonyl) Carbonyl Compounds
作者:You-Dong Shao、Dao-Juan Cheng
DOI:10.1002/adsc.201700187
日期:2017.8.7
2-difunctionalization reaction of indolenines with α-(benzothiazol-2-ylsulfonyl) carbonyl compounds was developed. By employing the strategy of Brønsted acid-assisted chiral phosphoric acid catalysis, the Mannich addition/Smiles rearrangement cascade occurred smoothly and provided a new family of optically active 1,2-difunctionalized 2-substituted indolines in good yields and enantioselectivities.
A novel intramolecular Smilesrearrangement of α-fluoro-β-keto-pyrimidylsulfones (usually used as a carbon nucleophile) was developed, providing a versatile avenue for synthesis of tri/tetra-substituted monofluorinated pyrimidyl enol ethers. Among these, diverse (Z)-monofluorovinylsulfones and sulfinates were efficiently assembled by adding extra electrophile and fine-tuning reaction conditions. The