Iodine Promoted Regioselective α-Sulfenylation of Carbonyl Compounds using Dimethyl Sulfoxide as an Oxidant
作者:Yogesh Siddaraju、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.6b03084
日期:2016.12.2
A metal-free regioselective sulfenylation of the α-CH3 group of ketones has been achieved in the presence of the α-CH2 or α-CH group using the cross dehydrogenative (CDC) strategy. Aldehydes also exhibit good selectivity forming the corresponding α-sulfenylated products. This efficient sulfenylation of ketones or aldehydes with thiones or heterocyclic thiols utilizes dimethyl sulfoxide (DMSO) as an
Screening of ligands for the Ullmann synthesis of electron-rich diaryl ethers
作者:Nicola Otto、Till Opatz
DOI:10.3762/bjoc.8.122
日期:——
In the search for new ligands for the Ullmanndiaryl ether synthesis, permitting the coupling of electron-rich aryl bromides at relatively low temperatures, 56 structurally diverse multidentate ligands were screened in a model system that uses copper iodide in acetonitrile with potassium phosphate as the base. The ligands differed largely in their performance, but no privileged structural class could
synthesis of chalcones and flavanones has been described. 2-(Benzo[d]thiazol-2-ylsulfonyl)-1-phenylethanones have been developed as new reagents for direct Julia–Kocienski olefination with aldehydes in the presence of a base, afforded chalcones in good to excellent yields. Whereas, 2-(benzo[d]thiazol-2-ylsulfonyl)-1-(2-hydroxyphenyl)ethanone reacted with the aromatic aldehydes to furnish flavanones
已经描述了朱莉娅-科辛斯基烯烃合成在查耳酮和黄烷酮合成中的新应用。2-(苯并[ d ]噻唑-2-基磺酰基)-1-苯乙酮已被开发为用于直接朱莉娅- Kocienski烯新试剂在碱的存在下的醛,得到良好的查耳酮以优良的产率。而2-(苯并[ d ]噻唑-2-基磺酰基)-1-(2-羟基苯基)乙酮与芳族醛反应,通过一锅内分子内环化反应以高收率提供黄烷酮。
Novel <i>N</i>,<i>S</i>-Phenacyl Protecting Group and Its Application
for Peptide Synthesis
作者:Guo Tang、Tao Ji、An-Fu Hu、Yu-Fen Zhao
DOI:10.1055/s-2008-1077887
日期:——
The phenacyl group can be introduced onto amino and thio groups by N,S-alkylation reactions. Conversely, these groups are removed rapidly by employing magnesium in acetic acid. This protectinggroup was successfully applied to a short peptidesynthesis ofBoc-L-Cys-Gly-OMe.