Room-temperature synthesis of pharmaceutically important carboxylic acids bearing the 1,2,4-oxadiazole moiety
作者:Marina Tarasenko、Nikolay Duderin、Tatyana Sharonova、Sergey Baykov、Anton Shetnev、Alexey V. Smirnov
DOI:10.1016/j.tetlet.2017.08.020
日期:2017.9
An efficient and mild one-pot protocol has been developed for the synthesis of 1,2,4-oxadiazoles via the reaction of amidoximes with dicarboxylic acidanhydrides in a NaOH/DMSO medium. The method allows the synthesis of diversely substituted carboxylic acids bearing the 1,2,4-oxadiazole motif, – a popular building block for pharmaceutical research, in moderate to excellent yields. The reaction scope
A photoredox and Brønsted acid synergistically catalyzed cross‐dehydrogenative C−Ocouplingreaction is developed in which isochroman peroxyacetals are formed through sp3 C−H bond peroxidation. The reported method is characterized by its extremely mild reaction conditions, excellent yields, and broad substrate scope. An oxocarbenium ion p‐chlorobenzenesulfonate was speculated to be the reactive intermediate
Investigation of the reactivity of 4-amino-5-hydrazineyl-4<i>H</i>-1,2, 4-triazole-3-thiol towards some selected carbonyl compounds: synthesis of novel triazolotriazine-, triazolotetrazine-, and triazolopthalazine derivatives
作者:Kamal M. El-Shaieb、Asmaa H. Mohamed、Fathy F. Abdel-latif
DOI:10.1515/znb-2019-0140
日期:2019.12.18
The reactivity of 4-amino-5-hydrazineyl-4H-1,2,4-triazole-3-thiol (1) towards several carbonyl compounds was investigated. We have found that on treatment of 1 with isatoic anhydride (2), 1,8-naphthalic anhydride (4), diphenic anhydride (6), pyromellitic dianhydride (8), and tetrabromophthalic anhydride (10), the reaction proceeds to give triazolotetrazine- and triazolophthalazine derivatives in good
[structure: see text] The combinatorial parallel synthesis of peptide-biphenylhybrids on solid support using state of the art of peptide synthesis is reported. Key steps were the N to C addition of an amino moiety, hydrolysis of the methyl ester, and the absence of cross-linked compounds when the 2,2'-diamino-1,1'-biphenyl was incorporated. When tested for activity as calpaininhibitors, some of the compounds
Synthesis of rac-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi>α</mml:mi></mml:math>-aryl propionaldehydes via branched-selective hydroformylation of terminal arylalkenes using water-soluble Rh-PNP catalyst
the substitute on phenyl ring of ligands. These ligands were incorporated into water-soluble rhodium-PNP complex catalysts that were used to regioselective hydroformylation of a series of terminal arylalkenes, providing efficient access to rac-α-aryl propionaldehydes in good to excellent yield (up to 97%) and branched-regioselectivity (up to 40:1 b/l ratio). Furthermore, gram-scale and diverse synthetic
这项工作详细介绍了一类水溶性 PNP 配体的制备,这些配体因配体苯环上取代物的性质而异。这些配体被掺入水溶性铑-PNP络合物催化剂中,用于一系列末端芳基烯烃的区域选择性加氢甲酰化,从而以良好至极好的收率(高达 97%)和支链-区域选择性(高达 40:1 b / l比率)。此外,克级和多样化的合成转化证明了该方法在非甾体抗炎药中的合成应用。