One-pot synthesis of sulfonyl (E)-stilbenes by nitrobenzene-mediated dimerizative desulfonation of benzylic sulfones
摘要:
A facile one-pot synthetic route for preparing sulfonyl (E)-stilbenes 4 is developed. The efficient route is realized by a nitrobenzene (PhNO2)-mediated dimerizative desulfonation of benzylic sulfones 3 in the presence of sodium hydride (NaH) in good yields. Some synthetic investigations of sulfonyl stilbenes 4 are also examined. (C) 2014 Elsevier Ltd. All rights reserved.
A general and practical sulfonylation of benzylic ammonium salts with sulfonyl hydrazides for the synthesis of sulfones
作者:Haibo Zhu、Yingying Zhang、Yishuai Liu、Liu Yang、Zongbo Xie、Guofang Jiang、Zhang-Gao Le
DOI:10.1016/j.tetlet.2020.151975
日期:2020.6
transition-metal-free cross-coupling of sulfonyl hydrazides with benzyl ammonium salts has been developed to synthesize benzyl sulfones using Cs2CO3 as base under mild conditions. The protocol employs stable and easy to handle coupling partners, and is endowed with good substrate compatibility, leading to functional benzyl sulfones in good yields.
已经开发出一种实用且有效的方法,该方法采用磺酰肼与苄基铵盐的无过渡金属交叉偶联,以Cs 2 CO 3为碱,在温和条件下合成苄基砜。该方案使用稳定且易于操作的偶联伙伴,并具有良好的底物相容性,从而可以高收率生产功能性苄砜。
Ruthenium(II) porphyrin catalyzed cyclopropanation of alkenes with tosylhydrazones
作者:Jun-Long Zhang、Philip Wai Hong Chan、Chi-Ming Che
DOI:10.1016/j.tetlet.2003.09.157
日期:2003.11
The diastereoselective ruthenium(II) porphyrincatalyzed cyclopropanation of a variety of alkenes with aryl diazomethanes generated in situ from stable tosylhydrazone derivatives, was achieved in good to excellent yields (up to 92%) and product turnovers. The practical utility of [RuII(p-Cl-TPP)(CO)] (H2(p-Cl-TPP)=meso-tetrakis(p-chlorophenyl)porphyrin) 3 was illustrated in the synthesis of the potent
Intramolecular hydrogen bonds involving polar carbon–hydrogen bonds: infrared and<sup>1</sup>H nuclear magnetic resonance spectra of some cyanomethyl and benzyl sulphones
作者:Michael P. Sammes、Richard L. Harlow
DOI:10.1039/p29760001130
日期:——
prepared, in which a polar methylene group is allowed on steric grounds to interact intramolecularly with a nearby donor atom. The i.r. and 1H n.m.r. spectra of these sulphones are compared with spectra of reference compounds in which no such interaction is possible. No conclusive evidence for intramolecularhydrogenbonds is found: possible causes for the observed spectral shifts are discussed.
已经制备了分别包含氰基甲基磺酰基和苄基磺酰基的两个系列的砜,其中在空间上允许极性的亚甲基与附近的供体原子分子内相互作用。将这些砜的ir和1 H nmr光谱与参考化合物的光谱进行了比较,在参考光谱中不可能发生这种相互作用。找不到分子内氢键的确凿证据:讨论了观察到的光谱位移的可能原因。
Photoinduced Synthesis of Bis‐Sulfonyl γ‐Arylated Ketones via DMAP/DDQ‐Mediated Stereogenic Conjugated Addition of α‐Sulfonyl Chalcones with Benzylic Sulfones
作者:Nai‐Chen Hsueh、Meng‐Yang Chang
DOI:10.1002/adsc.202201347
日期:2023.2.21
The DMAP/DDQ-mediated stereochemical conjugated addition of sulfonyl chalcones and benzylic sulfones under photolytic irradiation produces diverse bis-sulfonyl γ-arylated ketones with three contiguous stereogenic centers in a yield of 79%–92%. Herein, a plausible mechanism is proposed and discussed.
Synthesis of diarylcyclopropyl spirocyclic ketones
作者:Meng-Yang Chang、Chieh-Kai Chan、Yi-Chia Chen
DOI:10.1016/j.tet.2014.02.056
日期:2014.4
A facile one-pot synthetic route for preparing a series of functionalized diarylcyclopropyl spirocyclic ketones 4 is developed. The efficient cyclopropanation route of the conjugated cyclic ketones 2 with sulfones 1 in the presence of NaH shows interesting molecular diversities. The reaction mechanism of the stereocontrolled cyclopropanations has been discussed. (C) 2014 Elsevier Ltd. All rights reserved.