A stereoselective synthesis of α-halo vinyl sulfides and their applications in organic synthesis
摘要:
alpha -Halo vinyl sulfides have been synthesized stereoselectively via the addition of the in situ! generated hydrogen halide to acetylenic thioether. alpha -Halo vinyl sulfides are versatile substrates that can undergo many important transformations. (C) 2001 Elsevier Science Ltd. All rights reserved.
4‐chirality transfer from sulfur to a carbon stereocenter through a sulfonium [3,3]‐sigmatropic rearrangement. This reaction delivers α‐arylated thioesters and amides under mild conditions in an atom‐economical manner. The products are formed in high yields with enantiomeric ratios up to 99.5:0.5. Quantum chemical calculations suggest a mechanism for the chirality transfer from sulfur to carbon and explain
Asymmetric [2+2] Cycloaddition Reaction between α,β-Unsaturated Acid Derivatives and Alkynyl or Alkenyl Sulfides Catalyzed by a Chiral Titanium Reagent
作者:Yujiro Hayashi、Koichi Narasaka
DOI:10.1246/cl.1990.1295
日期:1990.8
Asymmetric [2+2] cycloaddition reaction between 3-(acryloyl)-1,3-oxazolidin-2-one derivatives and alkynyl or alkenyl sulfides proceeds by the use of a chiral titanium reagent to give the corresponding cyclobutene or cyclobutane derivatives in high enantioselectivity.
α-Aminoacidderivatives are key components of the molecules of life. A hydrative amination of ynamides/thioalkynes under metal-free and mild conditions has been developed. This practical strategy offers a new and convenient avenue for the synthesis of α-aminoacidderivativesusing readily available sulfinamides as nitrogen sources. Computational studies suggest that the reaction is enabled by a new
Hydroformylation of Alkynyl Sulfides: A Stereo‐ and Regioselective Route to α‐Sulfenyl Acroleins
作者:Patrick Wagner、Mihaela Gulea、Nicolas Girard
DOI:10.1002/adsc.202301349
日期:2024.3.19
sulfides. Additionally, one can take advantage of the possibility of the sulfur oxidation to obtain an alkenyl sulfoxide or sulfone, and so altering the electronic behavior of the carbon-carbon double bond. So far, the synthesis of α-sulfanyl acroleins (Scheme 1) is mainly based on general methods involving the incorporation of the sulfur function into an α,β-unsaturated aldehyde as a nucleophile (Scheme 1
In the presence of certain Lewis acids, alkenes containing an alkylthio group (for example, ketene dithioacetals, alkenyl sulfides, alkynyl sulfides, and allenyl sulfides) react with electron deficient olefins to give the corresponding cyclobutane, cyclobutene, or methylene cyclobutane derivatives. By employing a chiral titanium catalyst generated in situ from dichlorodiisopropoxytitanium and a tartrate-derived chiral diol, the [2 + 2] cycloaddition reaction proceeds with high enantioselectivity.