Selective synthesis of bis[1,2]dithiolo[1,4]thiazines from 4-isopropylamino-5-chloro-1,2-dithiole-3-ones
摘要:
Reaction of 4-isopi-opylamiiio-5-chloro-1,2-dithiole-3-oiies 3 and S2Cl2 in acetonitrile gave selectively 3-oxo-bis[1,2]dithiolo[1,4]tliiazine-5-tiliones I by the addition of triethylamine and bis[1,2]dithiolo[1,4]thiazine-3,5-diones 5 under the action of formic acid. 3,5-Diones 5 were also obtained by intramolecular cyclization of N,N-bis(5-chloro-3-oxo[1,2]dithiol-4-yl)amines 6 with S,Cl, in the presence of Et3N. (c) 2007 Elsevier Ltd. All rights reserved.
Transformations of N-ethylamines into amide derivatives under the action of sulfur monochloride
作者:L. S. Konstantinova、A. A. Berezin、O. A. Rakitin
DOI:10.1007/s11172-007-0179-9
日期:2007.6
Tertiary N-ethylamines were converted into amide derivatives by reactions with sulfurmonochloride and DABCO at 0 °C. Depending on the nature of the substituents in the amine, the reaction can be accompanied by unexpected transformations.
通过在 0 °C 下与一氯化硫和 DABCO 反应,将叔 N-乙胺转化为酰胺衍生物。根据胺中取代基的性质,该反应可能伴随着意想不到的转变。
Conversion of N-alkyldiisopropylamines into N,N-bis(5-chloro-3-oxo[1,2]dithiol-4-yl)amines
作者:Susana Barriga、Lidia S. Konstantinova、Carlos F. Marcos、Oleg A. Rakitin、Charles W. Rees、Tomás Torroba、Andrew J. P. White、David J. Williams
DOI:10.1039/a904680a
日期:——
Triisopropylamine 1a and S2Cl2, in the presence of DABCO and formic acid, give the bicyclic amine 2a, and its N-dealkylated product 3, rather than the tricyclic bisdithiolothiazine system 7 produced by Hünig’s base 1b. However, when S2Cl2 is in molar excess over DABCO, Hünig’s base and related N-alkyldiisopropylamines 1c–g also give the analogous bicyclic compounds 2b–g together with the tricyclic compounds 7b–g. The N-benzyl compound 2c is debenzylated quantitatively to the secondary amine 3 by sulfuric acid. X-Ray crystallography of N,N-bis(dithiolyl)ethylamine 2b shows the two dithiole rings to be steeply inclined to each other (85°) and the geometry at nitrogen to be slightly pyramidal. The crystal packing is dominated by S· · ·O electrostatic and weak CO· · ·Cl charge-transfer interactions.
Selective synthesis of bis[1,2]dithiolo[1,4]thiazines from 4-isopropylamino-5-chloro-1,2-dithiole-3-ones
作者:Lidia S. Konstantinova、Andrej A. Berezin、Kirill A. Lysov、Oleg A. Rakitin
DOI:10.1016/j.tetlet.2007.06.071
日期:2007.8
Reaction of 4-isopi-opylamiiio-5-chloro-1,2-dithiole-3-oiies 3 and S2Cl2 in acetonitrile gave selectively 3-oxo-bis[1,2]dithiolo[1,4]tliiazine-5-tiliones I by the addition of triethylamine and bis[1,2]dithiolo[1,4]thiazine-3,5-diones 5 under the action of formic acid. 3,5-Diones 5 were also obtained by intramolecular cyclization of N,N-bis(5-chloro-3-oxo[1,2]dithiol-4-yl)amines 6 with S,Cl, in the presence of Et3N. (c) 2007 Elsevier Ltd. All rights reserved.