4-正丁基-3,4-二氢-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮的合成
2011-01-06苏杭何西平张丽卢翠芬杨桂春
苏杭,何西平,张丽,卢翠芬,杨桂春
(湖北大学化学化工学院,湖北 武汉430062)
4-正丁基-3,4-二氢-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮的合成
苏杭,何西平,张丽,卢翠芬,杨桂春
(湖北大学化学化工学院,湖北 武汉430062)
以氰基乙酸乙酯为起始原料,经4步反应得到目标化合物4-正丁基-3,4-二氢-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮,反应条件温和,后处理简单.经红外、核磁分析,所得数据与其结构相吻合.
噻吩;二氮杂卓;合成
二氮杂卓化合物具有二氮杂七元环结构,显示出重要的药理学活性,如抗癫痫、镇静催眠、抑制逆转录酶及抗HIV等[1],自19世纪被发现以来,就引起了有机合成工作者和药学家的极大关注[2-5].已报道的二氮杂卓化合物主要有咪唑并二氮杂卓[6]、苯并二氮杂卓[7]、嘧啶并二氮杂卓[8]、吡唑并二氮杂卓[9]、噻吩并二氮杂卓[10]等.文中以氰基乙酸乙酯为原料合成了一类结构新颖的4-正丁基-3,4-二氢-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮化合物.
首先,将氰基乙酸乙酯与酮发生Gewald反应得到2-氨基噻吩3-羧酸乙酯类化合物,再依次与溴乙酰溴、正丁胺反应,最后在碱性作用下关环得到目标物4-正丁基-3,4-二氢-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮类化合物,具体合成路线如Scheme 1所示.
Scheme 1 4-正丁基-3,4-二氢-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮的合成路线a:R1,R2= CH3(CH2)4;b:R1,R2= CH3(CH2)3;c:R1=Ph,R2=H;d:R1=CH3,R2=CH3
1 实验部分
1.1 测试仪器熔点用WRS-IA数字熔点仪测定,上海精密科学仪器有限公司,温度计未校正;红外光谱用PE-Spectrum One型红外光谱仪测定,NaCl-单晶涂片;核磁共振谱用INOVA(600MHz)测定,以CDCl3为溶剂,TMS(0.03%)为内标.
1.2 原料及试剂的处理CH2Cl2:AR,P2O5回流干燥;溴乙酰溴:减压蒸馏处理;三乙胺:钠丝回流干燥.
1.3 实验步骤
1.3.1 化合物2的制备 氰基乙酸乙酯1(1.92mL,18mmol)溶于30mL无水乙醇,加入酮(18 mmol),硫粉(0.576g,18mmol),吗啡啉(1.58mL,18mmol),回流搅拌18h.减压浓缩,乙醇重结晶得黄色化合物2.
1.3.2 化合物3的制备 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℃下反应4h.减压蒸馏除去THF,剩余物溶于CH2Cl2,依次用饱和NaHCO3溶液和饱和食盐水洗涤,无水MgSO4干燥.滤液浓缩后经柱分离(硅胶,乙酸乙酯∶石油醚=1∶10,V/V)得化合物3.
1.3.3 化合物4的制备 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),室温反应4h.用饱和食盐水洗涤,无水 MgSO4干燥,滤液浓缩后经柱分离(硅胶,乙酸乙酯∶石油醚=1∶8,V/V)得化合物4.
1.3.4 化合物5的制备 化合物4 (2.0mmol)溶于 CH3CN(10mL),加入 K2CO3(0.138g,1.0mmol),回流反应3h.减压除溶剂,剩余物用CH2Cl2溶解,饱和食盐水洗涤,无水MgSO4干燥,滤液浓缩后柱层析纯化(硅胶,乙酸乙酯∶石油醚=1∶5,V/V)得化合物5.
2 结果与讨论
2.1 结果通过熔点测定,红外光谱及核磁共振确定了他们的结构,其数据如下:
2a:2-氨基-5,6,7,8-四氢-4H-环庚并[b]噻吩-3-乙酸乙酯 产率: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-5,6,7,8-四氢-4H-环己并[b]噻吩-3-乙酸乙酯 产率: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 产率: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 产率: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)-5,6,7,8-四氢-4H-环庚并[b]噻吩-3-乙酸乙酯 产率: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)-5,6,7,8-四氢-4H-环己并[b]噻吩-3-乙酸乙酯 产率: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)-5,6,7,8-四氢-4H-噻吩-3-乙酸乙酯 产率: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)-5,6,7,8-四氢-4H-噻吩-3-乙酸乙酯 产率: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)-5,6,7,8-四氢-4H-环庚并[b]噻吩-3-乙酸乙酯 产率: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)-5,6,7,8-四氢-4H-环己并[b]噻吩-3-乙酸乙酯 产率: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)-5,6,7,8-四氢-4H-噻吩-3-乙酸乙酯 产率: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)-5,6,7,8-四氢-4H-噻吩-3-乙酸乙酯 产率: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-3,4-二氢-1H-环庚并噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮 产率: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-3,4-二氢-1H-环己噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮 产率: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-3,4-二氢-6-苯基-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮 产率: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-3,4-二氢-6,7-二甲基-1H-噻吩并 [2,3-e][1,4]-二氮杂卓-2,5-二酮 产率: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 讨论以氰基乙酸乙酯为起始原料,经过Gewald反应、氨化、取代、成环等4步反应,得到结构新颖的4-正丁基-3,4-二氢-1H-噻吩并[2,3-e][1,4]-二氮杂卓-2,5-二酮化合物,反应条件温和,后处理简单.经红外、核磁分析,所得数据与其结构相吻合.
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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
湖北省自然科学基金重点项目(2008CDA078)资助
苏杭(1986-),男,硕士生;杨桂春,通信作者,教授,E-mail:yangguichun@hubu.edu.cn
(责任编辑 胡小洋)