One-Step Synthesis of Dialkyl 2-[(4-Methylphenyl)sulfonyl]-1H-pyrrole-3,4-dicarboxylates by Reaction of Acetylenedicarboxylates with ‘Tosylmethyl Isocyanide’ (TsMIC) and Triphenylphosphine
The reactive 1 : 1 adducts in the reaction between Ph3P and dialkyl acetylenedicarboxylates have been trapped with ‘tosylmethyl isocyanide’ (TsMIC; 1) to yield dialkyl 2-[(4-methylphenyl)sulfonyl]-1H-pyrrole-3,4-dicarboxylates 3 (Scheme 1). The structures of the highly functionalized compounds 3 were corroborated spectroscopically (IR, 1H- and 13C-NMR, and EI-MS) and by elemental analyses. A plausible
Development of a Synthetic Method for Multifunctionalized Pyrroles Using Isocyanide Dichloride as a Key Intermediate
作者:Takahiro Soeta、Akihiro Matsumoto、Yutaka Ukaji
DOI:10.1021/acs.joc.8b00185
日期:2018.4.20
Multifunctionalized pyrrole derivatives were synthesized using a highly efficient method based on the Michael addition of carbanions generated in situ from isocyanide dichloride to α,β-unsaturated carbonyl compounds. The reactions proceeded smoothly to afford the pyrrole derivatives in good to high yields. A wide range of Michael acceptors, such as α,β-unsaturated carbonyl compounds and nitroolefin
Base mediated reactions in solid-liquid media. A 1,3-dipolar cycloaddition route to pyrrolines and pyrroles from imino chlorosulfides.
作者:Fabienne Berrée、Evelyne Marchand、Georges Morel
DOI:10.1016/s0040-4039(00)60030-8
日期:1992.10
Nitrile ylides, generated in basic conditions (HCI abstraction) from N-[tosylmethyl] and N-[diethoxyphosphorylmethyl] imino chlorosuifides, undergo 1,3-dipolar cycloadditions with electron-deficient dipolarophiles to produce pyrroles and pyrrolines. Heterogeneous media are found to furnish the best conditions for these reactions. One pyrrole can also be prepared from methyl N-[ethoxycarbonylmethyl] chiorothioimidate and dimethyl acetylenedicarboxylate on alumina-potassium fluoride mixture as solid support, under microwave irradiation.