A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethersfrom (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72–94%). Using quaternary ammonium salts
Indium-mediated mild and efficient one-pot synthesis of alkyl phenyl selenides
作者:Wanida Munbunjong、Eun Hwa Lee、Warinthorn Chavasiri、Doo Ok Jang
DOI:10.1016/j.tetlet.2005.10.025
日期:2005.12
A mild and convenient one-pot process for synthesizing alkylphenylselenides is developed using indium metal. The reaction shows the selectivity for tert-alkyl, benzylic, and allylic halides over primary and secondary alkyl halides.
Indium-mediated cleavage of diphenyl diselenide and diphenyl disulfide: efficient one-pot synthesis of unsymmetrical diorganyl selenides, sulfides, and selenoesters
作者:Wanida Munbunjong、Eun Hwa Lee、Poonlarp Ngernmaneerat、Sung Jun Kim、Gurpinder Singh、Warinthorn Chavasiri、Doo Ok Jang
DOI:10.1016/j.tet.2009.01.072
日期:2009.3
convenient and efficient method was developed for the synthesis of alkyl phenyl selenides, sulfides, and selenoesters in one-pot reaction by using indium metal. The reaction showed the selectivity for tert-alkyl, benzylic, and allylic halides over primary and secondary alkyl halides. For the reaction of primary and secondary alkyl iodides and bromides, the yields of selenides were improved by the addition
We present here our results on the preparation of 2-alkynylbenzyl selenide and sulfide derivatives via Sonogashira cross-coupling of benzyl chalcogenides with different alkynes. This cross-coupling reaction proceeded cleanly under mild conditions and was performed with propargyl alcohol as well as alkyl- and arylalkynes. Subsequent electrophilic-cyclization reaction of the 2-alkynylbenzyl selenide and sulfide derivatives using iodine as an electrophilic source gave 4-iodo-3-substituted 1H-isoselenochromenes and -isothiochromenes in moderate yields. The unique product obtained during the course of this cyclization contained a six-membered ring which was confirmed by X-ray diffraction analysis.
我们在此介绍通过苄基卤化物与不同炔烃的 Sonogashira 交联反应制备 2-炔苄基硒化物和硫化物衍生物的研究成果。这种交叉偶联反应在温和的条件下进行,并可与丙炔醇以及烷基和芳基炔进行反应。以碘为亲电源,2-炔苄基硒化物和硫化衍生物随后发生亲电环化反应,以中等产率得到了 4-碘-3-取代的 1H-异硒二苯并二氢吡喃和异二苯并二氢吡喃。这种环化过程中得到的独特产物含有一个六元环,并通过 X 射线衍射分析得到了证实。