Facile and efficient preparation of α-halomethyl ketones from α-diazo ketones catalyzed by iron(III) halides and silica gel
作者:Xinxia Shi、Lingqiong Zhang、Pengfei Yang、Han Sun、Yilan Zhang、Chunsong Xie、Zhen Ou-yang、Min Wang
DOI:10.1016/j.tetlet.2018.02.024
日期:2018.3
An efficient and mild method for the synthesis of α-halomethyl ketones from α-diazo ketones was developed using ferric chloride or bromide as the halogen source and silica gel as the hydrogen source, with good to excellent yields.
Stereoselective Synthesis of<i>cis</i>-2,6-Disubstituted Morpholines and 1,4-Oxathianes by Intramolecular Reductive Etherification of 1,5-Diketones
作者:Santosh J. Gharpure、Dandela Anuradha、Jonnalagadda V. K. Prasad、Pidugu Srinivasa Rao
DOI:10.1002/ejoc.201403294
日期:2015.1
A simple and efficient, Lewis acid catalysed reductiveetherification strategy for the stereoselectivesynthesis of cis-2,6-disubstituted morpholines and 1,4-oxathianes starting from readily available 1,5-diketones has been developed. The strategy is used in the total synthesis of morpholine-based natural products (±)-chelonin A and formal total synthesis of (±)-chelonin C.
已经开发了一种简单有效的路易斯酸催化还原醚化策略,用于从容易获得的 1,5-二酮开始立体选择性合成顺式 2,6-二取代吗啉和 1,4-氧杂环丙烷。该策略用于吗啉类天然产物 (±)-chelonin A 的全合成和 (±)-chelonin C 的正式全合成。
Selective Debromination of α,α,α‐Tribromomethylketones with HBr–H
<sub>2</sub>
O Reductive Catalytic System
A debrominationreaction to synthesize α‐mono‐ and α,α‐dibromomethylketones with high selectivity from α,α,α‐tribromomethylketones by the controlling of H2OHBr reductive conditions was developed.
A new method has been developed for the copper(I)-mediated trifluoromethylthiolation of α-bromoketone using commercial anhydrous potassium fluoride, elemental sulfur, and (trifluoromethyl)-trimethylsilane in anhydrous N,N-dimethylformamide. This protocol provides facile access to a variety of α-trifluoromethylthiolated carbonyl compounds in moderate to excellent yields under mild and ligand free conditions
Synthesis and Antibiofilm Activity of a Second-Generation Reverse-Amide Oroidin Library: A Structure-Activity Relationship Study
作者:T. Eric Ballard、Justin J. Richards、Amanda L. Wolfe、Christian Melander
DOI:10.1002/chem.200801419
日期:——
A second-generationlibrary of 2-aminoimidazole-based derivatives incorporating a "reversed amide" (RA) motif in comparison to the marine natural product oroidin were synthesized and subsequently assayed for antibiofilmactivity against the medically relevant Gram-negative proteobacteria P. aeruginosa and A. baumannii. Most notably, an in-depth activity profile is reported for the most active subclass