Facile Synthesis of β-Tribromomethyl and Dibromomethylenated Nitroalkanes via Conjugate Addition of Bromoform to Nitroalkenes
作者:Bichismita Sahu、Guddeangadi N. Gururaja、Shaikh M. Mobin、Irishi N. N. Namboothiri
DOI:10.1021/jo802274q
日期:2009.3.20
Addition of bromoform to conjugatednitroalkenes in the presence of Mg provided β-tribromomethyl nitroalkanes in good to excellent yields and diastereoselectivity. These novel Michael adducts, formed under radical conditions, underwent elimination of HBr in the same pot under reflux to afford β-dibromomethylenated nitroalkanes in good yield. Alternatively, a one-pot high yielding synthesis of the dibromides
Regioselective Addition of Sulfur and Amine Nucleophiles To Assemble S═C–S, S–N, and Umpolung C–N Bonds: Exploration of the −CBr<sub>3</sub> Group as a Synthetic Equivalent of S═C–S
作者:Ankush Gupta、Guddeangadi N. Gururaja
DOI:10.1021/acs.orglett.4c00157
日期:2024.3.8
regioselective addition of sulfur and amine nucleophiles to a −CBr3 unit and nitromethyl moiety in a molecule with the installation of a five-diverse bond structure to novel isothiazole-5(2H)-thione is demonstrated. Umpolung of the nitromethyl group leads to a novel scaffold with selective C–N bond formation. Consequently, differentiating reactive centers by sulfur and amine nucleophiles has been proposed