Complex pyrrolidines via a tandem Michael reaction/1,3-dipolar cycloaddition sequence. A novel method for the generation of unsymmetrical azomethine ylides
Complex pyrrolidines via a tandem Michael reaction/1,3-dipolar cycloaddition sequence. A novel method for the generation of unsymmetrical azomethine ylides
Direct Synthesis of Amides from Carboxylic Acids and Amines Using B(OCH<sub>2</sub>CF<sub>3</sub>)<sub>3</sub>
作者:Rachel M. Lanigan、Pavel Starkov、Tom D. Sheppard
DOI:10.1021/jo400509n
日期:2013.5.3
range of amines. In most cases, the amide products can be purified by a simple filtration procedure using commercially available resins, with no need for aqueous workup or chromatography. The amidation of N-protected amino acids with both primary and secondary amines proceeds effectively, with very low levels of racemization. B(OCH2CF3)3 can also be used for the formylation of a range of amines in good
Effects of covalent modifications on the solid-state folding and packing of N-malonylglycine derivatives
作者:Gregory P. Dado、John M. Desper、Steven K. Holmgren、Christopher J. Rito、Samuel H. Gellman
DOI:10.1021/ja00038a057
日期:1992.6
structures of triamides 14 and diamide esters 5 and 6 are described. In crystalline form, 1, 2, and 4 adopt conformations containing an intramolecular N-H...O=C hydrogenbond in a nine-membered ring. Triamide 3 and ester diamides 5 and 6 experience only intermolecular hydrogenbonding in the solidstate. We have previously concluded, on the basis of IR and 1 H NMR measurements, that triamide 1 manifests