Facile Synthesis of 4-Alkyl (and Aryl)-2-aryl-6-diazo-4H- thieno[3,2-b]pyridine-5,7-diones
摘要:
Treatment of 3-{3-alkyl (and aryl)amino-5-arylthieno-2-yl}-2-diazo-3-oxopropanoates 8 with TMSOTf (3 equiv) in the presence of Et3N (6 equiv) in CH2Cl2 for 1 h at room temperature afforded 4-alkyl (and aryl)-2-aryl-6-diazo-4H-thieno[3,2-b]pyridine-5,7-diones 14 in excellent yields. On heating of 14 in the presence of a catalytic amount of Rh-2(CF3CF2CF2CO2)(4) in PhH for 4-10 h at reflux, corresponding ring contraction products, 4-alkyl (and aryl)-5,6-dihydro-4H-thieno[3,2-b]pyrrol-5-ones 16, were produced in good to excellent yields.
Carbon–carbon bond formation is among the most important reactions in organic synthesis. Reconstruction of a carbon–carbon bond through ring-opening C–Cbondcleavage of a strained carbocycle usually occurs via a thermodynamically preferable pathway. However, carbon–carbon bond formation through thermodynamically less favorable C–Cbondcleavage has seldom been documented. Herein, we disclose an unusual
A Facile and Convenient Synthesis of 3-Alkylamino-5-arylthiophenes with a Variety of Substituents at C-2 and Studies of Reaction Mechanisms
作者:Bo Sung Kim、Kyongtae Kim
DOI:10.1021/jo991884b
日期:2000.6.1
Thioaroylketene S,N-acetals were treated with active methylene compounds including beta-keto ester, nitromethane, cyanoacetic acid, p-toluenesulfonylacetone, 4-nitrophenylacetic acid, and diethyl (2-oxopropyl)phosphonate in the presence of mercury(II) acetate in CH(2)Cl(2) at room temperature. These reactions gave 3-alkylamino-5-arylthiophenes containing various substituents, which comprised, respectively
Novel Synthesis of <i>cis</i>-Nickel(II) 3-Alkylimino-3-alkyl(or aryl)thio-1-arylpropenethiolates and Their Application to the Preparation of 5-Aryl-3-(arylthio)isothiazoles
作者:Dong Joon Lee、Bo Sung Kim、Kyongtae Kim
DOI:10.1021/jo010631r
日期:2002.7.1
EtOH at room temperature gave cis-Ni(II)-3-alkylimino-3-alkylthio-1-arylpropenethiolates 3 in excellent yields. Heating a mixture of 3 and alkyl- or arylthiols in 1,2-dichloroethane gave new keteneS,N-acetals 4 having new alkyl- or arylthio groups depending on the thiols employed. For the first time, 5-aryl-3-(arylthio)isothiazoles were prepared from 2 with an arylthio group according to a known procedure
A convenient synthesis of 3-alkyl-2,3-dihydro-2,4-dioxo-6-phenyl-, 3-alkyl-2,3-dihydro-4-oxo-6-phenyl-2-thioxo-, and 3-alkyl-2-arylimino-2,3-dihydro-4-oxo-6-phenyl-4<i>H</i>-1,3-thiazines
作者:Sung Hoon Kim、Yong Hoon Ra、Yoon Young Lee、Kyongtae Kim、Joong Hyup Kim
DOI:10.1002/jhet.5570310611
日期:1994.11
the reaction mixture with triethylamine gave 3-alkyl-2,3-dihydro-4-oxo-6-phenyl-2-thioxo- 4, 3-alkyl-2,3-dihydro-2,4-dioxo-6-phenyl-4H-1,3-thiazines 5, respectively in good to excellent yields. Similarly treatment of compounds 3 with N-arylimidoyl dichloride in benzene at room temperature gave 3-alkyl-2-arylimino-2,3-dihydro-4-oxo-6-phenyl-4H-1,3-thiazines 6 in excellent yields. The reactions of compounds
1-烷基氨基-1-烷基硫-3-苯基丙烯-3-硫酮3与硫光气和光气在甲苯中的反应,然后用三乙胺处理反应混合物,得到3-烷基-2,3-二氢-4-氧代- 6-苯基-2-硫代-4-,3-烷基-2,3-二氢-2,4-二氧代-6-苯基-4 H -1,3-噻嗪5分别具有良好至优异的产率。类似地处理化合物3与Ñ -arylimidoyl在室温下在二氯化苯,得到3-烷基-2-芳基亚氨基-2,3-二氢-4-氧代-6-苯基-4- ħ -1,3-噻嗪6以优良产率。化合物3与草酰氯在甲苯中的反应也得到5 丰产。
Reactions of Thioaroylketene <i>S,N</i>-Acetals with 1,3-Dicarbonyl Compounds in the Presence of Mercury(II) Acetate: A General Route to 2-Acyl- and 2-Aroyl-3-(alkylamino)-5- arylthiophenes and 2-(Ethoxycarbonyl)-3- (methylamino)-5-arylthiophenes