Acyclic Selenoiminium Salts: Isolation, First Structural Characterization, and Reactions
作者:Yuichiro Mutoh、Toshiaki Murai
DOI:10.1021/ol034334f
日期:2003.4.1
[reaction: see text] A variety of selenoiminium salts were obtained by reacting the corresponding selenoamides with methyl triflate at room temperature for 30 s. All of the salts were stable under air. The structures of the selenoiminium salts were determined by X-ray molecular analysis. An aromatic selenoiminium salt reacted with BuLi (3 equiv) to give two types of ketones. In a reaction with LiAlH(4)/Te
Reaction of diisobutylaluminium hydride with selenium and tellurium: new reagents for the synthesis of seleno- and telluro-amides
作者:Guang Ming Li、Ralph A. Zingaro
DOI:10.1039/a707792k
日期:——
Diisobutylaluminium hydride (Bui2AlH) undergoes reaction with elemental selenium and tellurium to afford new reagents having an Al–Se or an Al–Te bond. These directly convert amides to selenoamides and telluroformamides. This affords a one-pot route to selenoamides and telluroformamides starting from Se and Te, and may be suitable for large scale syntheses.
Conversion of Amides,<i>N</i>,<i>N</i>,<i>N</i>′,<i>N</i>′-Tetramethylurea, and Esters to the Corresponding Selenoxo Compounds by Treatment with Bis(trimethylsilyl) Selenide and BF<sub>3</sub>·OEt<sub>2</sub>
The reactions of amides and N,N,N′,N′-tetramethylurea with (Me3Si)2Se in the presence of BF3·OEt2 afforded the corresponding slelenoxo compounds in good yields. On the other hand, selenation of ethyl and butyl benzoates in a similar manner gave benzoin and 2,3,5,6-tetraphenyl-1,4-diselenin via selenoesters. The trapping of selenoesters was also achieved by 2,3-dimethyl-1,3-butadiene to afford [4+2] cycloadducts.
Oxygen–selenium exchange using phenylselenophosphonic dichloride [PhP(Se)Cl<sub>2</sub>]: conversion of CO into CSe
作者:Joseph P. Michael、David H. Reid、Beate G. Rose、Richard A. Speirs
DOI:10.1039/c39880001494
日期:——
Phenylselenophosphonicdichloride brings about preparatively useful oxygen–seleniumexchange reactions in conjugated carbonyl and masked carbonyl compounds, thus enabling tertiary selenoamides, indolizine-3-selenoaldehydes, 1,2-dithiol-3-selones, 1,6aλ4-dithia-6-selenapentalenes, and 6aλ4-thia-6-selena-1,2-diazapentalenes to be prepared.
Reactions of Thioamides and Selenoamides with Hydrazonoyl Chlorides Under Phase-Transfer Conditions. A Convenient Method of Preparation of δ<sup>2</sup>-1,3,4-Thiadiazolines and δ<sup>2</sup>-1,3,4-Selenadiazolines
作者:M. L. Petrov、M. A. Abramov
DOI:10.1080/10426509808545473
日期:1998.2.1
Reactions of enolizable thio- and selenoamides with hydrazonoyl chlorides in the presence of bases and phase-transfer catalysts result in 2-dialkylamino-Δ2-1,3,4-thia- and selenadiazolines. The reactions proceed through formation of corresponding enethiolates and eneselenolates. At 80°C 2-dialkylamino-Δ2-1,3,4-thia- and selenadiazolines eliminate dialkylamines, giving 2-ylidene-Δ2-1,3,4-thia- and selenadiazolines