The highlyenantioselectiveaddition of 1-fluoro-1,1-bis(phenylsulfonyl)methane (FBSM) to vinylogousiminesgenerated in situfrom 2-aryl-3-(1-arylsulfonylmethyl)indoles was achieved using chiral ammonium salts derived from cinchona alkaloids. One-pot conversion from 2-arylindoles with FBSM was also adaptable under the same reaction conditions. The key for this transformation is the effective use of
InBr<sub>3</sub>: A Versatile Catalyst for the Different Types of Friedel−Crafts Reactions
作者:Ponnaboina Thirupathi、Sung Soo Kim
DOI:10.1021/jo9014613
日期:2009.10.16
Mild and efficient InBr3-catalyzed Friedel−Crafts alkylation of heteroaromatic or electron-rich aromatic compounds with α-amido sulfones at room temperature in CH2Cl2 has been developed. The products undergo further Friedel−Crafts alkylation with heteroaromatic or electron-rich aromatic compounds leading to unsymmetrical or bis-symmetrical triaryl methanes in good yield. α-Amido sulfones are employed
sulfones with nitro ketals promoted by KF on alumina provides the corresponding adducts which, upon treatment with p-toluenesulfonic acid, generate the corresponding N-alkoxycarbonyl-2,5-disubstituted pyrroles. The latter transformation involves a cascade process including ketal cleavage, ring closure and final aromatization by nitrous acid elimination.
Different modes of acid-catalyzed cyclization of 4-(γ-oxoalkyl)semicarbazide hydrazones: 7-membered versus 14-membered cyclic semicarbazones formation
作者:Anastasia A. Fesenko、Anatoly D. Shutalev
DOI:10.1016/j.tet.2015.10.079
日期:2015.12
Acid-catalyzed cyclization of 4-(gamma-oxoalkyl)semicarbazide hydrazones has been studied. 7-Membered cyclic semicarbazones, 2,4,5,6-tetrahydro-3H-1,2,4-triazepin-3-ones, were obtained from the gamma-phenyl-substituted semicarbazides, while the cyclization of the gamma-methyl-substituted semicarbazides involved two molecules of the starting material to result in 14-membered cyclic bis-semicarbazones, 1,2,4,8,9,11-hexaazacyclotetradeca-7,14-diene-3,10-diones. The 4-(gamma-oxoalkyl)semicarbazide hydrazones were prepared according to a four-step synthesis based on amidoallcylation of the sodium enolates of 1,3-diketones with ethyl N-(1-tosylallc-1-yl)carbamates followed by base-promoted retro-Claisen reaction and treatment of the obtained ethyl N-(gamma-oxoalkyl)carbamates with hydrazine. (C) 2015 Elsevier Ltd. All rights reserved.
Olijnsma,T. et al., Recueil des Travaux Chimiques des Pays-Bas, 1967, vol. 86, # 12, p. 1281 - 1287