作者:C. Jongsma、J.J. De Kok、R.J.M. Weustink、M. Van Der Ley、J. Bulthuis、F. Bickelhaupt
DOI:10.1016/0040-4020(77)80127-0
日期:1977.1
Stibatriptycene (1c) has been synthesized by cyclization of 9-(o-chlorophenyl)-9,10-dihydro-9-stibaanthracene (2c) with an excess of lithium piperidide. The general applicability of this ring closure reaction, first developed for the synthesis of phosphatriptycene (1a) and presumed to proceed by nucleophilic attack of a carbanionic centre on a (slowly generated) benzyne, has further been demonstrated
通过将9-(邻氯苯基)-9,10-二氢-9-stibaanthracene(2c)与过量的哌啶锂进行环化反应,合成了三苯并噻吩(1c)。该闭环反应的普遍适用性首先是为合成磷酸三苯并(1a)而开发的,推测是通过碳负离子中心在(缓慢生成的)苯并苯上的亲核攻击而进行的,而这种新的已知的三苯并噻吩的合成又进一步证明了该反应的普遍适用性。 (1b)和由stitriptriptycene合成(1c)。1c的结构通过IR,1 H NMR,特别是通过13 C NMR光谱法确认。
Tin for organic synthesis. 10. Unconventional regiospecific syntheses of aromatic carbonamides and thiocarbonamides by means of tin-mediated Friedel-Crafts reactions
作者:Martin Arnswald、Wilhelm P. Neumann
DOI:10.1021/jo00077a020
日期:1993.12
Friedel-Crafts reactions of stannylarenes 1 with tosyl isocyanate (TsNCO, 2) give N-tosylcarbonamides 3 via ipso substitution of the stannyl group. Thus, unconventionally substituted aromatic carbonamides can be obtained. The combination of the reaction of 1 and 2 with that of 1 and chlorosulfonyl isocyanate (14) allows one-pot syntheses of N-(arylsulfonyl)-substituted aromatic carbonamides with optional substitution patterns on both aromatic rings. The known ipso-specific substitutions of stannylarenes with 14 are extended to bi- and tricyclic arenes as well as to thiophenes 6 and 22. One stannyl group can serve as a leaving group for two aromatic systems, as shown with diaryldialkyltins 29. Also, stannylalkanes such as 27 react with 14 to afford alkylsulfonyl isocyanates and products of further reactions, such as 28. From the reactions of 1 with ethoxycarbonyl isothiocyanate (32), ortho- and meta-substituted aromatic thiocarbonamides 33 which are potential precursors for further syntheses, are accessible. The scope, limitations, and mechanism of these electrophilic substitutions are outlined.
Bartlett, E. H.; Eaborn, C.; Walton, D. R. M., Journal of the Chemical Society C: Organic
作者:Bartlett, E. H.、Eaborn, C.、Walton, D. R. M.
DOI:——
日期:——
Bartlett, E. H.; Eaborn, C.; Walton, D. R. M., Chemical Abstracts, U.S. Clearinghouse Fed. Sci. Tech. Inform. AD 701102 (1969)11 S., 1973, vol. 73, p. 35473