描述了1-(二芳基甲基)-2-异硫氰酸根合苯到2,4-二芳基-4 H -3,1-苯并噻嗪衍生物的新的重排。在Friedel-Crafts条件下用三氯化铝处理起始化合物导致芳基取代基通过亲电的ipso取代机理迁移,然后环化形成3,1-苯并噻嗪环。预期的分子内硫代氨基甲酰化反应也会发生,并且5,11-dihydro-6 H -dibenzo [ b,e分离出[]氮杂-5-硫酮副产物。讨论了影响反应机理和选择性的因素。还合成了相应的1-(芳基甲基)-2-异硫氰酸根合苯衍生物,并研究了它们在Friedel-Crafts反应条件下的行为,以证实中间体二苯甲基/苄基阳离子的稳定性在确定反应过程中的关键作用。 1-(二芳基甲基)-2-异硫氰酸根合苯-Friedel-Crafts-重排-芳基迁移-3,1-苯并噻嗪
Intramolecular nitrene insertions into aromatic and heteroaromatic systmes. Part 7. Insertions into electron-deficient rings
作者:Robert N. Carde、Peter C. Hayes、Gurnos Jones、Cynthia J. Cliff
DOI:10.1039/p19810001132
日期:——
thermolysis at 200 °C gave azepino-indoles (48) and (51), the first examples of ringexpansion by an arylnitrene of benzenerings with electron-with drawing substituents. Also reported are syntheses of 3- and 4-(2-azidobenzyl)pyridines (38) and (39), and of 2-(2-azidobenzyl)thiazole (40); decomposition of these azides gave mainly polymers.
Pyrolysis of 4,4-diaryl-1,4-dihydro-2H-3,1-benzoxazin-2-ones at 230–240 °C gives 9-arylacridines and (2-aminophenyl)diarylmethanes. Their formation correlates well with the mass fragmentation of the respective parent compounds.
4,4-二芳基-1,4-二氢-2H-3,1-苯并恶嗪-2-酮在 230–240 °C 下热解得到 9-芳基吖啶和(2-氨基苯基)二芳基甲烷。它们的形成与各自母体化合物的质量碎裂密切相关。
Aromatic ring transfer—a new synthesis of 2,4-diaryl-4H-3,1-benzothiazines
作者:Vladimir T. Abaev、Fatima A. Tsiunchik、Andrey V. Gutnov、Alexander V. Butin
DOI:10.1016/j.tetlet.2006.04.010
日期:2006.6
A new synthetic approach to 2,4-diaryl-4H-3,1-benzothiazines is described based on the rearrangement of 2-isothiocyano triarylmethanes in the presence of AlCl3. An aryl ring is found to migrate to the carbon atom of an isothiocyano group followed by intramolecular cyclization as a result of electrophilic attack of the benzhydryl carbocation on the sulfur atom. (c) 2006 Elsevier Ltd. All rights reserved.
CARDE R. N.; HAYES P. C.; JONES G.; CLIFF C. J., J. CHEM. SOC. PERKIN TRANS., PART 1, 1981, NO 4, 1132-1142
作者:CARDE R. N.、 HAYES P. C.、 JONES G.、 CLIFF C. J.
DOI:——
日期:——
Aryl Ring Migration Reaction in the Synthesis of 2,4-Diaryl-4H-3,1-benzothiazines
thiocarbamoylation reaction also takes place, and 5,11-dihydro-6H-dibenzo[b,e]azepine-5-thiones are isolated as byproducts. Factors influencing the mechanism and selectivity of the reaction are discussed. The corresponding 1-(arylmethyl)-2-isothiocyanatobenzene derivatives were also synthesized, and their behavior under Friedel-Crafts reaction conditions was investigated to confirm the crucial role
描述了1-(二芳基甲基)-2-异硫氰酸根合苯到2,4-二芳基-4 H -3,1-苯并噻嗪衍生物的新的重排。在Friedel-Crafts条件下用三氯化铝处理起始化合物导致芳基取代基通过亲电的ipso取代机理迁移,然后环化形成3,1-苯并噻嗪环。预期的分子内硫代氨基甲酰化反应也会发生,并且5,11-dihydro-6 H -dibenzo [ b,e分离出[]氮杂-5-硫酮副产物。讨论了影响反应机理和选择性的因素。还合成了相应的1-(芳基甲基)-2-异硫氰酸根合苯衍生物,并研究了它们在Friedel-Crafts反应条件下的行为,以证实中间体二苯甲基/苄基阳离子的稳定性在确定反应过程中的关键作用。 1-(二芳基甲基)-2-异硫氰酸根合苯-Friedel-Crafts-重排-芳基迁移-3,1-苯并噻嗪