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4-正丁基-3,4-二氫-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮的合成

2011-01-06 07:52蘇杭何西平張麗盧翠芬楊桂春
關(guān)鍵詞:二酮噻吩丁基

蘇杭,何西平,張麗,盧翠芬,楊桂春

(湖北大學(xué)化學(xué)化工學(xué)院,湖北 武漢430062)

4-正丁基-3,4-二氫-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮的合成

蘇杭,何西平,張麗,盧翠芬,楊桂春

(湖北大學(xué)化學(xué)化工學(xué)院,湖北 武漢430062)

以氰基乙酸乙酯為起始原料,經(jīng)4步反應(yīng)得到目標(biāo)化合物4-正丁基-3,4-二氫-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮,反應(yīng)條件溫和,后處理簡單.經(jīng)紅外、核磁分析,所得數(shù)據(jù)與其結(jié)構(gòu)相吻合.

噻吩;二氮雜卓;合成

二氮雜卓化合物具有二氮雜七元環(huán)結(jié)構(gòu),顯示出重要的藥理學(xué)活性,如抗癲癇、鎮(zhèn)靜催眠、抑制逆轉(zhuǎn)錄酶及抗HIV等[1],自19世紀(jì)被發(fā)現(xiàn)以來,就引起了有機(jī)合成工作者和藥學(xué)家的極大關(guān)注[2-5].已報(bào)道的二氮雜卓化合物主要有咪唑并二氮雜卓[6]、苯并二氮雜卓[7]、嘧啶并二氮雜卓[8]、吡唑并二氮雜卓[9]、噻吩并二氮雜卓[10]等.文中以氰基乙酸乙酯為原料合成了一類結(jié)構(gòu)新穎的4-正丁基-3,4-二氫-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮化合物.

首先,將氰基乙酸乙酯與酮發(fā)生Gewald反應(yīng)得到2-氨基噻吩3-羧酸乙酯類化合物,再依次與溴乙酰溴、正丁胺反應(yīng),最后在堿性作用下關(guān)環(huán)得到目標(biāo)物4-正丁基-3,4-二氫-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮類化合物,具體合成路線如Scheme 1所示.

Scheme 1 4-正丁基-3,4-二氫-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮的合成路線a:R1,R2= CH3(CH2)4;b:R1,R2= CH3(CH2)3;c:R1=Ph,R2=H;d:R1=CH3,R2=CH3

1 實(shí)驗(yàn)部分

1.1 測試儀器熔點(diǎn)用WRS-IA數(shù)字熔點(diǎn)儀測定,上海精密科學(xué)儀器有限公司,溫度計(jì)未校正;紅外光譜用PE-Spectrum One型紅外光譜儀測定,NaCl-單晶涂片;核磁共振譜用INOVA(600MHz)測定,以CDCl3為溶劑,TMS(0.03%)為內(nèi)標(biāo).

1.2 原料及試劑的處理CH2Cl2:AR,P2O5回流干燥;溴乙酰溴:減壓蒸餾處理;三乙胺:鈉絲回流干燥.

1.3 實(shí)驗(yàn)步驟

1.3.1 化合物2的制備 氰基乙酸乙酯1(1.92mL,18mmol)溶于30mL無水乙醇,加入酮(18 mmol),硫粉(0.576g,18mmol),嗎啡啉(1.58mL,18mmol),回流攪拌18h.減壓濃縮,乙醇重結(jié)晶得黃色化合物2.

1.3.2 化合物3的制備 化合物2(5.0mmol)溶于干燥的THF(15mL)中,加入干燥Et3N(0.73mL,5.0mmol),冰浴下逐滴加入溴乙酰溴(1.05mL,5.1mmol)的THF(5mL)溶液,滴完后撤去冰水浴,40℃下反應(yīng)4h.減壓蒸餾除去THF,剩余物溶于CH2Cl2,依次用飽和NaHCO3溶液和飽和食鹽水洗滌,無水MgSO4干燥.濾液濃縮后經(jīng)柱分離(硅膠,乙酸乙酯∶石油醚=1∶10,V/V)得化合物3.

1.3.3 化合物4的制備 化合物3(5mmol)溶于干燥 CH2Cl2(10mL),加入正丁胺(0.54mL,5.5mmol)和三乙胺(0.80mL,5.5mmol),室溫反應(yīng)4h.用飽和食鹽水洗滌,無水 MgSO4干燥,濾液濃縮后經(jīng)柱分離(硅膠,乙酸乙酯∶石油醚=1∶8,V/V)得化合物4.

1.3.4 化合物5的制備 化合物4 (2.0mmol)溶于 CH3CN(10mL),加入 K2CO3(0.138g,1.0mmol),回流反應(yīng)3h.減壓除溶劑,剩余物用CH2Cl2溶解,飽和食鹽水洗滌,無水MgSO4干燥,濾液濃縮后柱層析純化(硅膠,乙酸乙酯∶石油醚=1∶5,V/V)得化合物5.

2 結(jié)果與討論

2.1 結(jié)果通過熔點(diǎn)測定,紅外光譜及核磁共振確定了他們的結(jié)構(gòu),其數(shù)據(jù)如下:

2a:2-氨基-5,6,7,8-四氫-4H-環(huán)庚并[b]噻吩-3-乙酸乙酯 產(chǎn)率:89%,mp:86.2~86.8℃.IR(NaCl):υ=3 420、3 315、1 662cm-1;1H NMR(CDCl3,600MHz):δ=1.34(t,3H,—CH3),1.58~1.61(m,4H,ring),1.77(m,2H,ring),2.54(m,2H,ring),2.95(m,2H,ring),4.26(q,2H,—OCH2—),5.74(s,2H,—NH2).

2b:2-氨基-5,6,7,8-四氫-4H-環(huán)己并[b]噻吩-3-乙酸乙酯 產(chǎn)率:85%,mp:114.5 ~114.9 ℃.IR(NaCl):υ=3 422、3 310、1 669cm-1;1H NMR (CDCl3,600MHz):δ=1.41(t,3H,—CH3),1.82(m,4H,ring),2.53(m,2H,ring),2.71(m,2H,ring),4.25(q,2H,—OCH2—),5.95(s,2H,—NH2).

2c:5-苯基-2-氨基噻吩-3-乙酸乙酯 產(chǎn)率:65%,mp:98.1~98.7℃.IR(NaCl):υ=3 421、3 315、1 661 cm-1;1H NMR(CDCl3,600MHz):δ=1.32(t,3H,—CH3),4.29(q,2H,—OCH2—),5.71(s,2H,—NH2),7.13(s,1H,═CH—),7.32~7.41(m,4H,ArH).

2d:4,5-二甲基-2-氨基噻吩-3-乙酸乙酯 產(chǎn)率:61%,mp:91.4 ℃.IR (NaCl):υ=3 420、3 310,1 663 cm-1;1H NMR(CDCl3,600MHz):δ=1.37(t,3H,—CH3),2.17(s,6H,—CCH3),4.28(m,2H,—OCH2—),5.89(s,2H,—NH2).

3a:2-(2-溴乙酰胺基)-5,6,7,8-四氫-4H-環(huán)庚并[b]噻吩-3-乙酸乙酯 產(chǎn)率:60%,mp:106.1~106.5℃.IR(NaCl):υ=3 242、1 660cm-1;1H NMR(CDCl3,600MHz):δ=1.41(t,3H,—CH3),1.62(m,2H,ring),1.66(m,2H,ring),1.85(m,2H,ring),2.73(m,2H,ring),3.05(m,2H,ring),4.07(s,2H,—COCH2—),4.40(q,2H,—OCH2—),11.92(s,1H,—NH—).

3b:2-(2-溴乙酰胺基)-5,6,7,8-四氫-4H-環(huán)己并[b]噻吩-3-乙酸乙酯 產(chǎn)率:62%.IR(NaCl):υ=3 221、1 651cm-1;1H NMR(CDCl3,600MHz):δ=1.42(t,3H,—CH3),1.80(m,4H,ring),2.51(m,2H,ring),2.70(m,2H,ring),4.08(s,2H,—COCH2),4.43(q,2H,—OCH2—),11.91(s,1H,—NH—).

3c:4-苯基-2-(2-溴乙酰胺基)-5,6,7,8-四氫-4H-噻吩-3-乙酸乙酯 產(chǎn)率:65%.IR(NaCl):υ=3 208、1 657cm-1;1H NMR(CDCl3,600MHz):δ=1.42(t,3H,—CH3),4.07(s,2H,—COCH2—),4.42(q,2H,—OCH2—),7.15(s,1H,═CH—),7.30~7.41(m,4H,ArH),11.94(s,1H,—NH—).

3d:4,5-二甲基-2-(2-溴乙酰胺基)-5,6,7,8-四氫-4H-噻吩-3-乙酸乙酯 產(chǎn)率:60%.IR(NaCl):υ=3 225、1 661cm-1;1H NMR(CDCl3,600MHz):δ=1.42(t,3H,—CH3),2.16(s,6H,═C|CH3),4.06(s,2H,—COCH2—),4.41(q,2H,—OCH2—),11.90(s,1H,—NH—).

4a:2-(2-正丁胺乙酰氨基)-5,6,7,8-四氫-4H-環(huán)庚并[b]噻吩-3-乙酸乙酯 產(chǎn)率:80%.IR(NaCl):υ=3 242、1 735、1 693cm-1;1H NMR(CDCl3,600MHz):δ=0.88(t,3H,—CH3),1.34(m,2H,—CH2—),1.41(t,3H,—CH2CH3),1.51(m,2H,—CH2—),1.61(m,2H,ring),1.66(m,2H,ring),1.86(m,2H,ring),2.66(m,2H,—NHCH2—),2.75(m,2H,ring),3.01(m,2H,ring),3.42(m,2H,—COCH2—),4.30(q,2H,—OCH2—),5.27(s,1H,—NH—),11.97(s,1H,—NH—).

4b:2-(2-正丁胺乙酰氨基)-5,6,7,8-四氫-4H-環(huán)己并[b]噻吩-3-乙酸乙酯 產(chǎn)率:78%.IR(NaCl):υ=3 231、1 734、1 690cm-1;1H NMR(CDCl3,600MHz):δ=0.89(t,3H,—CH3),1.35(m,2H,—CH2—),1.41(t,3H,—CH2CH3),1.51(m,2H,—CH2—),1.79(m,4H,ring),2.52(m,2H,ring),2.66(m,2H,—NHCH2—),2.71 (m,2H,ring),3.41(m,2H,—COCH2—),4.30(q,2H,—OCH2—),5.26(s,1H,—NH—),11.98(s,1H,—NH—).

4c:4-苯基-2-(2-正丁胺乙酰氨基)-5,6,7,8-四氫-4H-噻吩-3-乙酸乙酯 產(chǎn)率:75%.IR(NaCl):υ=3 242、1 730、1 692cm-1;1H NMR(CDCl3,600MHz):δ=0.88(t,3H,—CH3),1.33(m,2H,—CH2),1.41(t,3H,—CH2CH3),1.51(m,2H,—CH2—),2.66(m,2H,—NHCH2—),3.42(m,2H,—COCH2—),4.30(q,2H,—OCH2—),5.23(s,1H,—NH—),7.14(s,1H,═CH—),7.33~7.40(m,4H,ArH),11.95(s,1H,—NH—).

4d:4,5-二甲基-2-(2-正丁胺乙酰氨基)-5,6,7,8-四氫-4H-噻吩-3-乙酸乙酯 產(chǎn)率:77%.IR(NaCl):υ=3 242、1 735、1 693cm-1;1H NMR(CDCl3,600MHz):δ=0.89(t,3H,—CH3),1.34(m,2H,—CH2—),1.51(m,2H,—CH2—),2.17(s,6H,—CCH3),2.66(m,2H,—NHCH2—),3.40(m,2H,—COCH2—),4.30(q,2H,—OCH2—),5.27(s,1H,—NH—),11.97(s,1H,—NH—).

5a:4-正丁基-3,4-二氫-1H-環(huán)庚并噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮 產(chǎn)率:72%.IR(NaCl):υ=3 225、1 736、1 690cm-1;1H NMR(CDCl3,600MHz):δ=0.88(t,3H),1.34(m,2H),1.51(m,2H,—CH2—),1.60 (m,2H,ring),1.65(m,2H,ring),1.82(m,2H,ring),2.98(m,4H,ring),3.81(m,2H,—NHCH2—),3.90(d,J=13.2Hz,H,—COCH2—),4.33(d,J=13.2Hz,H,—COCH2—),5.27(s,1H,—NH—).

5b:4-正丁基-3,4-二氫-1H-環(huán)己噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮 產(chǎn)率:75%.IR(NaCl):υ=3 222、1 732、1 695cm-1;1H NMR(CDCl3,600MHz):δ= 0.89(t,3H),1.33(m,2H),1.52(m,2H,—CH2),1.82 (m,4H,ring),2.54 (m,2H,ring),2.72 (m,2H,ring),3.72(m,2H,—NHCH2—),3.88(d,J=13.8Hz,1H,—COCH2—),4.30(d,J=13.8Hz,1H,—COCH2—),5.29(s,1H,—NH—).

5c:4-正丁基-3,4-二氫-6-苯基-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮 產(chǎn)率:70%.IR(NaCl):υ=3 220、1 730、1 661cm-1;1H NMR(CDCl3,600MHz):δ=0.88(t,3H),1.33(m,2H),1.53(m,2H,—CH2—),3.80(m,2H,—NHCH2—),3.87(d,J=13.2Hz,H,—COCH2—),4.32(d,J=13.2Hz,H,—COCH2—),5.26(s,1H,—NH—),7.13(s,1H,═CH—),7.30~7.42(m,4H,ArH).

5d:4-正丁基-3,4-二氫-6,7-二甲基-1H-噻吩并 [2,3-e][1,4]-二氮雜卓-2,5-二酮 產(chǎn)率:77%.IR(NaCl):υ=3 223、1 731cm-1;1H NMR(CDCl3,600MHz):δ=0.89(t,3H),1.34(m,2H),1.51(m,2H,—CH2—),2.17 (s,6H,—CCH3),3.80(m,2H,—NHCH2—),3.92(d,J=13.8Hz,1H,—COCH2—),4.34(d,J=13.8Hz,1H,—COCH2—),5.27(s,1H,—NH—).

2.2 討論以氰基乙酸乙酯為起始原料,經(jīng)過Gewald反應(yīng)、氨化、取代、成環(huán)等4步反應(yīng),得到結(jié)構(gòu)新穎的4-正丁基-3,4-二氫-1H-噻吩并[2,3-e][1,4]-二氮雜卓-2,5-二酮化合物,反應(yīng)條件溫和,后處理簡單.經(jīng)紅外、核磁分析,所得數(shù)據(jù)與其結(jié)構(gòu)相吻合.

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[3]Yang J X,Che X,Dang Q,et al.Synthesis of tricyclic 4-chloro-pyrimido[4,5-b][1,4]benzodiazepines[J].Org Lett,2005,7(8):1541-1543.

[4]Tercel M,Stribbling S M,Sheppard H.Unsymmetrical DNA cross-linking agents:combination of the CBI and PBD pharmacophores[J].J Med Chem,2003,46(11):2132-2151.

[5]Katrizky A R,Nair S K.One-pot synthesis of 2,4-benzodiazepin-1-ones using benzotriazole methodology[J].J Org Chem,2002,67(23):8237-8238.

[6]Zhang P,Zhang N,Buckwold V E,et al.Chemical and biological effects of substitution of the 2-position of ringexpanded('fat')nucleosides containing the imidazo[4,5-e][1,3]diazepine-4,8-dione ring system:the role of electronic and steric factors on glycosidic bond stability and anti-HCV activity[J].Bioorgan Med Chem,2007,15(14):4933-4945.

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Synthesis of 4-butyl-3,4-dihydro-1H-thieno[2,3-e][1,4]diazepine-2,5-diones

SU Hang,HE Xiping,ZHANG Li,LU Cuifen,YANG Guichun
(School of Chemistry and Chemical Engineering,Hubei University,Wuhan 430062,China)

Novel compounds,4-butyl-3,4-dihydro-1H-thieno[2,3-e][1,4]diazepine-2,5-diones were synthesized using ethyl cyanacetate as initial material after a 4-step reaction,with mild reaction conditions and simple post treatment.The structure of the target molecules were detected by IR and1H NMR,and the spectrum results were consistent with the molecular structure.

thiophene;diazepine;synthesis

O622.6

A

1000-2375(2011)04-0501-04

2010-09-04

湖北省自然科學(xué)基金重點(diǎn)項(xiàng)目(2008CDA078)資助

蘇杭(1986-),男,碩士生;楊桂春,通信作者,教授,E-mail:yangguichun@hubu.edu.cn

(責(zé)任編輯 胡小洋)

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