Gold(I)-Catalyzed Synthesis of Highly Substituted 1,4-Dicarbonyl Derivatives via Sulfonium [3,3]-Sigmatropic Rearrangement
作者:Weiping Zhou、Arnaud Voituriez
DOI:10.1021/acs.orglett.0c04023
日期:2021.1.1
2-substituted 4-oxo-4-arylbutanal derivatives from commercially available or easily accessible alkynes and vinylsulfoxide substrates has been developed. Extension of the methodology to the use of 1-cycloalkenyl sulfoxides allowed the facile synthesis of five-, six-, and seven-membered-ring cycloalkyl-1-one backbone. Subsequently, the tetrahydrocycloalkyl[b]pyrrole derivatives, which are found in many active
已经开发了一种有效且直接的金催化方案,用于从市售或易于获得的炔烃和乙烯基亚砜底物合成2-取代的4-氧代-4-芳基丁醛衍生物。方法的扩展到使用1-环烯基亚砜使得可以容易地合成五,六和七元环的环烷基-1-一主链。随后,以良好的产率分离出了在许多活性药物成分中发现的四氢环烷基[ b ]吡咯衍生物。机理研究突出了在此过程中a中间体的[3,3]-σ重排。
New Chemical Synthesis of Functionalized Arylzinc Compounds from Aromatic or Thienyl Bromides under Mild Conditions Using a Simple Cobalt Catalyst and Zinc Dust
A new chemical method for the preparation of arylzinc intermediates is described in acetonitrile, on the basis of the activation of aryl bromides by low-valent cobalt species arising from the reduction of cobalt halide by zinc dust. This procedure allows for the synthesis of a variety of functionalized aryl- and thienylzinc species in good to excellent yields. The versatility and the simplicity of that original method represent an alternative to most known procedures.
Chirons in the 1,3-dioxane series: stereospecific cross-coupling reactions and chirality transfers
Palladium catalyzed cross-coupling reactions are described for enantiopure axially chiral vinylic bromides with arylzinc reagents leading to new compounds with axial chirality. In addition, transfers of axial to central chirality are described. Both reactions exhibit full retention of enantiomeric purity. (C) 1998 Elsevier Science Ltd. All rights reserved.