Organocatalytic selenosulfonylation of the C–C doublebond of α,β-unsaturatedketones to construct two contiguous stereogenic centers in an aqueous medium was described. A series of α-selenyl and β-sulfonyl ketones with various functional groups were synthesized in good yields and enantioselectivities with saturated NaCl solution as the solvent. In addition, this protocol had been successfully scaled
Aerobic copper-catalyzed synthesis of (E)-alkenyl sulfones and (E)-β-halo-alkenyl sulfones via addition of sodium sulfinates to alkynes
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2014.01.071
日期:2014.3
(E)-alkenyl sulfones. When a CuCl catalyst was employed, the hydrosulfonylation proceeded syn-selectively, and (E)-alkenyl sulfones were synthesized in excellent yields. In contrast, the reaction using CuI catalyst produced (E)-β-haloalkenyl sulfones anti-selectively in the presence of potassium halides. Furthermore, the (E)-β-bromoalkenyl sulfones are possible to convert into various alkenyl sulfones by Suzuki–Miyaura
Atroposelective Construction of Axially Chiral<scp>Alkene‐Indole</scp>Scaffolds<i>via</i>Catalytic Enantioselective Addition Reaction of<scp>3‐Alkynyl</scp>‐2‐indolylmethanols<sup>†</sup>
作者:Jing‐Yi Wang、Meng Sun、Xian‐Yang Yu、Yu‐Chen Zhang、Wei Tan、Feng Shi
DOI:10.1002/cjoc.202100214
日期:2021.8
for this addition reaction. By this strategy, a new class of axially chiral acyclic alkene-indoles was synthesized in overall high yields (up to 86%), excellent (E/Z)-selectivity (all > 95 : 5) and good enantioselectivities (up to 92 : 8 er). This reaction represents the first catalytic enantioselectiveconstruction of axially chiral alkene-indole frameworks, which will add a new member to the family
modular and regioselective approach proceeded via an unprecedented sequence of successive defluorination, dual sulfonylation, and annulation relay, along with four C(sp3)–F bonds cleaved and two new C–S bonds formed. In addition, this transition metal-free C–F bond functionalization which is amenable to gram-scale synthesis occurred under mild reaction conditions and has broad substrate scope and excellent
利用一锅多步多级联反应的合成策略特别受关注。在此,已经开发了一种有效的多氟烷基过氧化物与亚磺酸盐的三组分串联反应,用于容易地构建氟代烷基化的四取代呋喃衍生物。发现DABCO和Cs 2 CO 3的组合对于反应成功是必不可少的。这种模块化和区域选择性的方法是通过空前的依次进行连续除氟,双重磺酰化和环化反应以及四个C(sp 3)–F键断裂,形成了两个新的C–S键。另外,这种适合克级合成的无过渡金属的C-F键官能化反应在温和的反应条件下发生,具有广泛的底物范围和出色的官能团耐受性。此外,该脱氟方案还使复杂化合物的后期功能化成为可能,从而有可能在药物开发中找到合成用途。
Pd-catalyzed desulfitative arylation for the synthesis of 2,5-diarylated oxazole-4-carboxylates using dioxygen as the terminal oxidant
A novel palladium-catalyzed approach for constructing 2,5-diarylated oxazole-4-carboxylates using sodium arylsulfinates as the aryl source has been demonstrated.