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gx123go銀蟲(chóng) (小有名氣)
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[求助]
求助化學(xué)翻譯 謝謝
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In conclusion, nucleophilic phosphinocatalysis offers a simple and efficient method for the functional allylation of azoles under neutral conditions and furnishes attractive heterocyclic substituted Michael olefins. This reaction has been successfully expanded to a variety of azoles. However, there is an optimal range of pKa in order to avoid the polymerization of allene or the lack of nucleophilicity for the deprotonated azole. Using the conjunction of pyrrole carboxaldehyde and tributylphosphine with electron deficient allenes or alkynes, we were able to obtain substituted indolizines by a tandem reaction. |
| 總之,親核膦基催化反應(yīng)提供了一種簡(jiǎn)單而有效的方法,能用于唑類在中性條件下的功能烯丙基化反應(yīng),也能用于具吸引力的雜環(huán)取代的邁克爾烯烴反應(yīng)。這個(gè)反應(yīng)已經(jīng)成功擴(kuò)展到各種各樣的唑類。然而,為了避免聯(lián)烯的聚合反應(yīng)或去質(zhì)子化的唑缺乏親核性,需要確定一個(gè)pKa的最佳范圍。利用吡咯甲醛和帶有缺電子聯(lián)烯或炔烴的三丁基膦結(jié)合,我們就能夠通過(guò)串聯(lián)反應(yīng)取代得到中氮茚。 |
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