Ni-Catalyzed Cross-Electrophile Coupling of Aryl Triflates with Thiocarbonates via C–O/C–O Bond Cleavage
作者:Zhaodong Zhu、Yuxin Gong、Weiqi Tong、Weichao Xue、Hegui Gong
DOI:10.1021/acs.orglett.1c00313
日期:2021.3.19
A nickel-catalyzed reductive coupling of aryl triflates with thiocarbonates is reported here. Both electron-rich and -deficient aryl C(sp2)–O electrophiles as well as a class of O-tBu S-alkyl thiocarbonates are compatible with the optimized reaction conditions, as evidenced by 49 examples. The reaction also proceeds with good chemoselective cleavage of the C–O bond with regard to thioesters. This work
此处报道了芳基三氟甲磺酸酯与硫代碳酸酯的镍催化还原偶联。富电子和不足的芳基C(sp 2)-O亲电体以及一类O - t Bu S-烷基硫代碳酸酯都与优化的反应条件兼容,如49个实例所示。对于硫代酯,该反应还会以良好的C–O键化学选择性裂解来进行。这项工作拓宽了镍催化的还原交叉亲电子偶联反应的范围。
Synthesis and preliminary evaluation of the anti-cancer activity on A549 lung cancer cells of a series of unsaturated disulfides
We synthesized a series of small symmetrical unsaturated disulfides by a multi-step reaction starting from organic alcohols, and we performed a preliminary test to evaluate the effect of these compounds on the viability of A549 lung cancer cells. The garlic-derived natural compound diallyl disulfide, known for its anticancer activity, was used as the lead compound in this study. We synthesized five
The Regiochemistry of Cyclization of α-Sulfenyl-, α-Sulfinyl-, and α-Sulfonyl-5-hexenyl Radicals: Procedures Leading to Regioselective Syntheses of Cyclic Sulfones and Sulfoxides
作者:Ernest W. Della、Sean D. Graney
DOI:10.1021/jo0497306
日期:2004.5.1
quantities of 6-endo product, the α-sulfinyl species cyclizes with high selectivity (95.5:4.5) via a 5-exo mode. By contrast, ringclosure of the 5-methyl-5-hexenyl radicals is found to give substantially the 6-endo product in all cases. It is the α-sulfonyl-5-methyl-5-hexenyl radical that now exhibits high regioselectivity (97.5:2.5) for 6-endo closure: an illustration of the synthetic value of this observation
[EN] METHODS OF PREPARATION OF MACROCYCLIC COMPOUNDS<br/>[FR] PROCÉDÉS DE PRÉPARATION DE COMPOSÉS MACROCYCLIQUES
申请人:UNIV FLORIDA
公开号:WO2009105284A1
公开(公告)日:2009-08-27
The instant invention describes methods for producing macrocyclic compounds having antiproliferation activity, and useful in methods of treating disorders such as cancer, tumors and cell proliferation related disorders.
Full details of the concise and convergent synthesis (eight steps, 19% overall yield), its extension to the preparation of a series of key analogues, and the molecular target and pharmacophore of largazole are described. Central to the synthesis of largazole is a macrocyclization reaction for formation of the strained 16-membered depsipeptide core followed by an olefin cross-metathesis reaction for