The reaction of biscarbamoyl diselenides with aromatic compounds in the presence of Lewis acids resulted in Friedel-Crafts type carbamoylation (Gatterman amide synthesis) to give corresponding aromatic amides in good yields. This methodology was successfully applied to aroylation and benzylation by use of dibenzoyl diselenide and dibenzyl diselenide, respectively.
Selenoaldehydes and selenoketones were generated in situ, by treating aldehydes or ketones, respectively, with bis(1,5-cyclooctanediylboryl) selenide; the resulting selenocarbonyl compounds were trapped with 2,3-dimethyl-1,3-butadiene to give the corresponding [4+2] cycloadducts. The treatment of amides, an ester, and ketones possessing bulky substituents with the reagent also afforded the corresponding selenoamides, a selenoester, and sterically protected selones, respectively, in modest yields. On the other hand, a similar treatment of cinnamaldehyde with the reagent gave the 2,3-dihydroselenophene derivative, which originated from a [4+2]-type self-dimerization of in situ generated 3-phenyl-2-propeneselenal.
Radical-Cascade Avenue for 3,4-Fused-Ring-Substituted Thiophenes
作者:Abhijeet R. Agrawal、Neha Rani Kumar、Sashi Debnath、Sarasija Das、Chandan Kumar、Sanjio S. Zade
DOI:10.1021/acs.orglett.8b01577
日期:2018.8.17
A single-step intramolecular radical cascade reaction of diynes and thioacetic acid in the presence of a catalytic amount of azobis(isobutyronitrile) as a radical initiator has been developed to synthesize thiophenes. This method allows easy and effective construction of a thiophene scaffold having 3,4-fused-ring substitution and unsubstituted 2,5-positions for further functionalization and polymerization
已经开发出在催化量的偶氮二(异丁腈)作为自由基引发剂的存在下,二炔和硫代乙酸的单步分子内自由基级联反应以合成噻吩。该方法允许容易且有效地构建具有3,4-稠环取代和未取代的2,5-位的噻吩支架,用于进一步的官能化和聚合。使用该方法,合成了环戊[ c ]噻吩,3,4-乙撑二氧噻吩和含噻吩的螺环化合物的衍生物。
Synthesis and characterization of novel organic heteroatom compounds from reaction of Woollins' reagent with various organic substrates
作者:Guoxiong Hua、Junyi Du、David B. Cordes、Kasun S. A. Arachchige、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1080/10426507.2015.1072184
日期:2016.3.3
GRAPHICAL ABSTRACT ABSTRACT A series of new selenium-containing heteroatom compounds were synthesized in good yields by the reaction of Woollins’ reagent with various organicsubstrates such as cyclohexylamine, N-benzoylbenzamide, benzoic anhydride, 4-fluoro-N-(2-oxo-2-phenylethyl)benzamide, N-benzoylbenzamide, benzoic anhydride, 3-(bromomethyl)benzonitrile, 1,2-diphenylethane-1,2-diol, and sodium
图形摘要 摘要 通过伍林斯试剂与各种有机底物如环己胺、N-苯甲酰苯甲酰胺、苯甲酸酐、4-氟-N-(2-氧代- 2-苯基乙基)苯甲酰胺、N-苯甲酰基苯甲酰胺、苯甲酸酐、3-(溴甲基)苄腈、1,2-二苯基乙烷-1,2-二醇和醇钠。描述了三个代表性的 X 射线结构。
A Convenient Preparation of Piperidinium Selenocarboxylates
作者:Hideharu Ishihara、Shinya Muto、Shinzi Kato
DOI:10.1055/s-1986-31494
日期:——
Piperidinium selenocarboxylates were isolated from the reaction of bis[acyl] diselenides with piperidine in high yields.