Formal Substitution of Bromocyclopropanes with Nitrogen Nucleophiles
摘要:
A highly chemo- and diastereoselective protocol toward amino-substituted donor acceptor cyclopropanes via the formal nucleophilic displacement in bromocyclopropanes is described. A wide range of N-nucleophiles, including carboxamides, sulfonamides, azoles, and anilines, can be efficiently employed in this transformation, providing expeditious access to stereochemically defined and densely functionalized cydopropylamine derivatives.
Triphenylphosphine-catalysed amide bond formation between carboxylic acids and amines
作者:Danny C. Lenstra、Floris P. J. T. Rutjes、Jasmin Mecinović
DOI:10.1039/c4cc01861c
日期:——
Unactivated carboxylic acids and amines undergo organocatalytic Ph3P/CCl4-mediated amide bond formation by employing in situ reduction of triphenylphosphine oxide to triphenylphosphine in the presence of diethoxymethylsilane and bis(4-nitrophenyl)phosphate.