Stannylation of Aryl Halides, Stille Cross-Coupling, and One-Pot, Two-Step Stannylation/Stille Cross-Coupling Reactions under Solvent-Free Conditions
作者:Pavel S. Gribanov、Yulia D. Golenko、Maxim A. Topchiy、Lidiya I. Minaeva、Andrey F. Asachenko、Mikhail S. Nechaev
DOI:10.1002/ejoc.201701463
日期:2018.1.10
and without the use of high purity reagents. The developed synthetic procedures are versatile, robust, and easily scalable. The absence of solvent, and the elimination of isolation procedures of aryl stannanes makes SSC protocol simple, step economical, and highly efficient for the synthesis of biaryls via one-pot two-step procedure.
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.
Niestroj, Michael; Lube, Andreas; Neumann, Wilhelm P., Chemische Berichte, 1995, vol. 128, # 6, p. 575 - 580
作者:Niestroj, Michael、Lube, Andreas、Neumann, Wilhelm P.
Untersuchungen an Arylbleitriacetaten. Röntgenstrukturanalyse von 2-methylphenyl-und 2-chlorphenylbleitriacetat
作者:F. Huber、H. Preut、D. Scholz、M. Schürmann
DOI:10.1016/0022-328x(92)83382-r
日期:1992.12
The crystal structures of 2-XC6H4Pb(OAc)3 (X = CH3, Cl; OAc = OOCCH3) have been determined by X-ray diffraction. Both compounds are isostructural and crystallize as triclinic, space group P1BAR. They consist of monomers, the seven-coordinated central atom being in a distorted pentagonal-bipyramidal environment with five O atoms of the three unsymmetrically chelating carboxylate groups in equatorial positions, and one O and one C(aryl) atom in axial positions. IR, H-1, C-13 and Pb-207 NMR spectroscopic data of these and other monoaryllead triacetates are reported, and similar structures with seven-coordinated lead are inferred. Weak coordination of Y to Pb is discussed to exist possibly in 2-YC6H4Pb(OAc)3(Y = F, Cl, OCH3).