SYNTHESIS OF 7-ETHOXY-3-METHYL-4H-1,4-BENZOTHIAZINES
作者:Thandi Lai Kachhee、Vandana Gupta、Rajani Gupta、D.C. Gautam
DOI:10.1515/hc.2002.8.6.579
日期:2002.1
pharmacological activities'". Result and Discussions In the present work hitherto unknown 4H-l,4-benzothiazines have been synthesized by the condensation and oxidative cyclization of 2-amino-5-ethoxybenzenethiol I and active methylene compounds ΙΠ in DMSO. Under the experimental conditions 2-aminobenzenethiol I is readily oxidized to bis-(2-aminophenyl)disulphide Π. The reaction proceeds through the formation
4H-1,4-苯并噻嗪的合成是通过 5-乙氧基-2氨基苯硫醇与 β-二酮在 DMSO 中的缩合来报道的。2-氨基苯硫醇很容易被氧化成双-(2氨基苯基)二硫化物,它与β-二酮反应通过中间体烯氨基酮的形成环化成4H-1,4-苯并噻嗪。引言 4H-1,4-苯并噻嗪衍生物具有广泛的生物活性,类似于吩噻嗪,这是由于沿氮-硫轴存在折叠,这是赋予药理活性的结构特异性。合成迄今未知的苯并噻嗪以使其具有药理活性被认为是值得的”。结果和讨论在目前未知的 4H-l 中,4-苯并噻嗪已通过2-氨基-5-乙氧基苯硫醇I和活性亚甲基化合物III在DMSO中的缩合和氧化环化合成。在实验条件下,2-氨基苯硫醇 I 很容易被氧化成双-(2-氨基苯基)二硫化物 Π。该反应通过中间体烯氨基酮 V 的形成进行。由于烯氨基酮系统 V 的 α 位对亲核攻击的高反应性,它们通过硫-硫键的断裂环化为 4H-1,4-苯并噻嗪 VII。合成苯并噻嗪所需的
Synthesis of 2-amino-5-chloro-3-(trifluoromethyl)benzenethiol and conversion into 4H-1,4-benzothiazines and their sulfones
作者:Leby Thomas、Archana Gupta、Vandana Gupta
DOI:10.1016/s0022-1139(03)00092-7
日期:2003.8
The synthesis of 2-amino-5-chloro-3-(trifluoromethyl)benzenethiol was achieved by hydrolytic cleavage of 2-amino-6-chloro-4-(trifluoromethyl)benzothiazole which was prepared by cyclization of 4-chloro-2-(trifluoromethyl)phenylthiourea by bromine in chloroform, the phenylthiourea was prepared by the reaction of 4-chloro-2-(trifluoromethyl)aniline with ammonium thiocyanate in hydrochloric acid. Condensation
Bis(phenyl-β-diketonato)titanium(IV) ethoxide complexes: Ring-opening polymerization of l-lactide by solvent-free microwave irradiation
作者:Rianne M. Lord、Felix D. Janeway、Laura Bird、Patrick C. McGowan
DOI:10.1016/j.poly.2021.115520
日期:2022.1
A range of functionalized bis(phenyl-β-diketonato)titanium(IV) ethoxide complexes of the type [Ti(L)2(OEt)2], containing two asymmetric or symmetric phenyl-β-diketonate ligands (L), have been synthesized and fully characterized. Single crystal X-ray diffraction has been used to confirm that all structures crystallize with the ethoxide ancillary ligands in a cis arrangement and NMR spectra show characteristic