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.
在DABCO和甲酸的存在下,三异丙胺1a与S2Cl2反应生成双环胺2a及其N-去烷基化产物3,而不是由Hünig碱1b产生的三环双二硫氮杂环庚烷体系7。然而,当S2Cl2的摩尔过量于DABCO时,Hünig碱及相关N-烷基二异丙胺1c–g也能生成类似的双环化合物2b–g以及三环化合物7b–g。N-苄基化合物2c可通过硫酸定量去苄基化转化为二级胺3。N,N-双(二硫烷基)乙胺2b的X射线晶体学显示,两个二硫烷环彼此陡峭地倾斜(85°),氮原子周围的几何形状略呈锥形。晶体堆积主要受S··O静电作用和弱的CO··Cl电荷转移相互作用支配。