A route to benzylic arylsulfoxides from β-ketosulfoxides
作者:Meng-Yang Chang、Yu-Chieh Cheng、Chieh-Kai Chan
DOI:10.1016/j.tet.2016.05.038
日期:2016.7
The K2CO3-mediated benzylation of β-ketosulfoxides 4 with 2.0 equiv of benzylic halides 5 affords benzylic arylsulfoxides 6 in moderate yields along with trace amounts of chalcones 7. The products 6 are assumed to form in situ intermediates of sulfenate anions from β-ketosulfoxides which are commonly involved in carbon–sulfur bond formation. A plausible mechanism has been proposed.
用2当量的苄基卤化物5进行的K 2 CO 3介导的β-酮亚砜4的苄基化反应可中等产率地得到苄基芳基亚砜6以及痕量的查耳酮7。假定产物6原位形成了β-酮亚砜中的亚硫酸根阴离子的中间体,这些中间体通常参与碳-硫键的形成。已经提出了一种合理的机制。
Origin of the Stereoselectivity in (Ethoxycarbonyl)-, Cyano-, and Phenyl-Substituted (Arylsulfinyl)methyl Radicals
carbonyl-substituted (arylsulfinyl)methylradicals is presented, based on experimental results and semiempirical calculations. The influence of dipole-dipole interactions, allylic 1,3-strain (A1,3 strain), allylic 1,2-strain (A1,2 strain), and coulombic interactions is discussed based on stereoselectivities observed with (alkoxycarbonyl)-, cyano-, and aryl-substituted (arylsulfinyl)methylradicals. In the second part
Exploiting Substrate Diversity for Preparing Synthetically Valuable Sulfoxides via Asymmetric Hydrogenative Kinetic Resolution
作者:Héctor Fernández-Pérez、Joan R. Lao、Arnald Grabulosa、Anton Vidal-Ferran
DOI:10.1002/ejoc.202000592
日期:2020.8.2
The ability of a rhodium catalyst derived from phosphine‐phosphite ligands to hydrogenatively resolve a set of structurally diverse α,β‐unsaturated vinyl sulfoxides is reported. The practicality of the methodology was applied to the preparation of precursors of biologically active compounds.
Highly selective 30% hydrogen peroxide oxidation of sulfides to sulfoxides using micromixing
作者:Takuya Noguchi、Yoshiro Hirai、Masayuki Kirihara
DOI:10.1039/b802502a
日期:——
The highlyselectiveoxidation of sulfides to sulfoxidesusing 30% hydrogen peroxide has been achieved under catalyst-free conditions using a T-shaped micromixer.
Substituted (RS,SR)-1-phenylethyl phenylsulfoxides (threo) (XC6H4S(O)CH(CH3)C6H4Y) and some substituted (RR,SS)-sulfoxides (erythro) were prepared and kinetic investigation for the thermal decomposition was carried out at 80.0, 90.0, and 100.0 °C in dioxane. Hammett plots for threo-XC6H4S(O)CH(CH3)C6H5 gave positive ρ-values (ρX=0.60–0.64 at three temperatures), while those for threo- and erythro