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      氮雜環(huán)丙烷[3+2]環(huán)加成反應(yīng)研究進(jìn)展

      2015-11-24 07:53:53任鴻胡寶祥
      浙江化工 2015年1期
      關(guān)鍵詞:氰酸酯芳基雜環(huán)

      任鴻,胡寶祥

      (浙江工業(yè)大學(xué)化學(xué)工程學(xué)院,浙江杭州310014)

      氮雜環(huán)丙烷[3+2]環(huán)加成反應(yīng)研究進(jìn)展

      任鴻,胡寶祥

      (浙江工業(yè)大學(xué)化學(xué)工程學(xué)院,浙江杭州310014)

      介紹了最近幾年在不同催化體系下,氮雜環(huán)丙烷與含雙鍵化合物的[3+2]環(huán)加成反應(yīng)研究進(jìn)展。

      氮雜環(huán)丙烷;[3+2]環(huán)加成;綜述

      氮雜環(huán)丙烷是一類(lèi)含氮原子的三元雜環(huán)化合物,由于該三元環(huán)的張力極高,導(dǎo)致其具有較強(qiáng)的反應(yīng)活性,因而在有機(jī)合成中,基于氮雜環(huán)丙烷開(kāi)環(huán)反應(yīng)的應(yīng)用非常廣泛[1]。

      如式1所示,氮雜環(huán)丙烷在加熱或光輻射等條件下,易發(fā)生C-C鍵的斷裂,將環(huán)打開(kāi),形成亞甲胺內(nèi)钅翁鹽,然后參與1,3-偶極環(huán)加成反應(yīng),生成含氮五元雜環(huán)。另一方面,在路易斯酸作用下,氮雜環(huán)丙烷則發(fā)生C-N鍵的斷裂,與烯烴、炔烴、醛、腈類(lèi)和聯(lián)烯等含重鍵的化合物發(fā)生[3+2]環(huán)加成反應(yīng),生成另一種構(gòu)型的含氮五元雜環(huán)[2]。

      式1氮雜環(huán)丙烷參與的[3+2]開(kāi)環(huán)加成反應(yīng)

      1 氮雜環(huán)丙烷與烯烴類(lèi)化合物的反應(yīng)

      Yadav等人[3]報(bào)導(dǎo)了Sc(OTf)3可以作為路易斯酸催化N-對(duì)甲苯磺?;蓟s環(huán)丙烷得到1,3-二偶極體。當(dāng)與環(huán)烯醚反應(yīng)時(shí),可以得到相應(yīng)的吡咯烷,并且具有較高的收率和區(qū)域選擇性(式2)。

      式2 Sc(OTf)3催化氮雜環(huán)丙烷與烯烴的反應(yīng)

      2011年,Aggarwal等人[4]報(bào)導(dǎo)了應(yīng)用于合成紅藻氨酸的具有手性中心的吡咯烷類(lèi)化合物的手性合成,如式3。

      式3鈀催化氮雜環(huán)丙烷的環(huán)加成反應(yīng)

      2 氮雜環(huán)丙烷與炔烴類(lèi)化合物的反應(yīng)

      在與炔烴的[3+2]反應(yīng)中,許多路易斯酸都能催化該反應(yīng)的進(jìn)行[5]。一系列的芳基炔烴(式4)都能在FeCl3催化下與芳基氮雜環(huán)丙烷反應(yīng),得到官能團(tuán)化的吡咯類(lèi)化合物。

      式4 FeCl3催化氮雜環(huán)丙烷與炔烴的反應(yīng)

      3 氮雜環(huán)丙烷與腈類(lèi)化合物的反應(yīng)

      N-對(duì)甲苯磺?;s環(huán)丙烷與腈類(lèi)化合物的[3+2]環(huán)合反應(yīng)通常涉及到C-N鍵的斷裂。在對(duì)這類(lèi)反應(yīng)的研究中,主要是關(guān)于催化劑的探索,研究發(fā)現(xiàn),一系列的路易斯酸,比如BF3·OEt2[6-11,13],ZnX2(X=Cl,Br,I)[12],Zn(OTf)2[13],Sc(OTf)3[14],Bi(OTf)3[15]和Cu(OTf)2[16]都能應(yīng)用于該反應(yīng)。

      2005年,Yadav等人[10]利用TBDPS取代的氮雜環(huán)丙烷,在BF3·OEt2催化下與氰基發(fā)生[3+2]環(huán)加成反應(yīng)(式5)。

      2011年,Wei等人[15]以Bi(OTf)3為催化劑,催化N-對(duì)甲苯磺酰基氮雜環(huán)丙烷和一系列腈類(lèi)化合物之間的[3+2]環(huán)加成反應(yīng),得到相應(yīng)的咪唑啉,如式6。該方法同樣適用于稠環(huán)芳烴氮雜環(huán)丙烷。

      式5 BF3·OEt2催化氮雜環(huán)丙烷與氰基的反應(yīng)

      式6 Bi(OTf)3催化氮雜環(huán)丙烷與腈類(lèi)化合物的反應(yīng)

      4 氮雜環(huán)丙烷與含羰基類(lèi)化合物的反應(yīng)

      傳統(tǒng)的合成1,3-惡唑烷衍生物的方法都是從1,2-氨基醇和含羰基類(lèi)化合物出發(fā),在較高的溫度下進(jìn)行。并且該方法對(duì)底物限制較大,同時(shí)副反應(yīng)較多。因而越來(lái)越多的人開(kāi)始對(duì)由路易斯酸催化氮雜環(huán)丙烷與含羰基化合物反應(yīng)的研究產(chǎn)生了興趣。但到目前為止,對(duì)于催化該反應(yīng)的路易斯酸催化劑報(bào)導(dǎo)還比較少,只有BF3·OEt2[10],Cu(OTf)2[16],Zn(OTf)2[13],Sc(OTf)3[17]和AgSbF6[18]。

      叔丁基二苯基硅烷基取代的氮雜環(huán)丙烷在BF3·OEt2催化下,也可以與醛發(fā)生[3+2]環(huán)加成反應(yīng)[10]。該反應(yīng)在溫和的條件能快速進(jìn)行,并且適用于芳香族和脂肪族醛,反應(yīng)都有較高的收率,如式7。

      式7 BF3·OEt2催化氮雜環(huán)丙烷與醛的反應(yīng)

      2009年,Nguyen等[17]以Sc(OTf)3為催化劑,將2-烷基-N-對(duì)甲苯磺酰基氮雜環(huán)丙烷與醛或者酮反應(yīng),得到了5-烷基-1,3-惡唑烷,如式8。

      式8 Sc(OTf)3催化氮雜環(huán)丙烷與醛或酮的反應(yīng)

      2011年,Hanamoto等[18]開(kāi)發(fā)了AgSbF6作為氮雜環(huán)丙烷與醛的[3+2]環(huán)加成反應(yīng)催化劑,如式9。

      式9 AgSbF6催化氮雜環(huán)丙烷與醛的反應(yīng)

      5 氮雜環(huán)丙烷與CO2的反應(yīng)

      惡唑酮作為經(jīng)典的雜環(huán)化合物,廣泛應(yīng)用于有機(jī)合成及具有生物活性化合物的合成上面。而過(guò)去十年,CO2作為碳源研究的快速發(fā)展,吸引了越來(lái)越多來(lái)自有機(jī)合成及化工行業(yè)的興趣。到目前為止,報(bào)導(dǎo)的催化體系有堿金屬鹵化物[19-24],四烷基季銨鹽鹵化物[20],DBN[33],碘[24-28],自然存在的氨基酸[29],Cr(III)/DMAP[30],氯氧化鋯[31],聚乙二醇修飾的季銨鹽[32],氨基酸修飾的聚苯乙烯[33],聚乙二醇修飾的季鹽[34]和離子液體[35-36]等。

      2011年,Liu等[24]以DBN作催化劑,Li為助催化劑,成功合成了N-官能團(tuán)化2-惡唑酮,并推測(cè)了如式10所示反應(yīng)機(jī)理:首先DBN固定CO2,得到中間體a,再與氮雜環(huán)丙烷反應(yīng)得到中間體b;然后在LiI催化下環(huán)打開(kāi),并經(jīng)由分子內(nèi)環(huán)化得到目標(biāo)產(chǎn)物,并有較高的收率。

      式10 DBN催化氮雜環(huán)丙烷與CO2的反應(yīng)及其機(jī)理

      2010年,Jiang等[29]也報(bào)道了在無(wú)溶劑、催化劑的條件下,通過(guò)天然的α-氨基酸催化將CO2成功插入到氮雜環(huán)丙烷中,如式11。對(duì)于這類(lèi)反應(yīng),幾乎所有自然存在的α-氨基酸(例如,L-組氨酸)都是有效的催化劑。

      式11α-氨基酸催化氮雜環(huán)丙烷與CO2的反應(yīng)

      2010年,He等[35]首次報(bào)道了在無(wú)溶劑下,Lewis堿的離子液體催化氮雜環(huán)丙烷與CO2的反應(yīng),合成5-芳基惡唑酮,如式12。

      式12離子液體催化氮雜環(huán)丙烷與CO2的反應(yīng)

      2010年,Pinhas等[37]利用高速球磨技術(shù)(HSBM),在無(wú)溶劑和無(wú)催化劑條件下,在室溫條件下就能使2-烷基或2-芳基氮雜環(huán)丙烷與CO2發(fā)生環(huán)加成反應(yīng),如式13。

      式13無(wú)溶劑條件下氮雜環(huán)丙烷與CO2的反應(yīng)

      6 氮雜環(huán)丙烷與雜聯(lián)烯類(lèi)化合物的反應(yīng)

      2008年,Hou等[38]以三丁基膦為催化劑,催化N-對(duì)甲苯磺酰基氮雜環(huán)丙烷與二硫化碳及異硫氰酸酯的環(huán)加成反應(yīng),得到1,3-四氫噻唑衍生物,該化合物被廣泛應(yīng)用于有機(jī)合成及藥物化學(xué)領(lǐng)域,如式14。

      式14三丁基膦催化氮雜環(huán)丙烷與CS2或異硫氰酸酯的反應(yīng)

      2013年,Tharmalingam等[39]以水為溶劑,硝酸鐵為催化劑,催化氮雜環(huán)丙烷與異硫氰酸酯、異氰酸酯及異硒氰酸酯的環(huán)加成反應(yīng),如式15所示。

      式15 Fe(NO3)3催化氮雜環(huán)丙烷與異硒氰酸酯的反應(yīng)

      7 結(jié)語(yǔ)

      氮雜環(huán)丙烷參與的[3+2]環(huán)加成反應(yīng)在合成含氮五元雜環(huán)化合物中具有重要作用。隨著人們對(duì)其研究的深入,開(kāi)發(fā)了一系列催化劑并應(yīng)用于該反應(yīng)中,使其在有機(jī)合成、藥物和生物等領(lǐng)域的應(yīng)用越來(lái)越廣泛。在今后的研究中,重點(diǎn)仍在開(kāi)發(fā)出更多高效新型的催化劑,以在溫和的反應(yīng)條件中進(jìn)行,并且具有更廣的底物適用性。

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      The Research Progress in the[3+2]Cycloaddition of Azirdines

      REN Hong,HU Bao-Xiang
      (College of Chemical Engineering,Zhejiang University of Technology,Hangzhou,Zhejiang 310014,China)

      The research of the[3+2]cycloaddition of azirdines and compounds with double bond,for instance,alkene,alkyne,aldehyde and carbon dioxide,was reviewed.The developing prospects was also discussed.

      azirdines;[3+2]cycloaddition;research progress

      1006-4184(2015)1-0022-07

      2014-04-16

      國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):20876149)。

      任鴻(1989-),男,浙江東陽(yáng)人,碩士研究生,主要從事有機(jī)合成研究。E-mail:renhong1004@163.com。

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