Synthesis of Alkyl- and Aryl-Substituted Pyridines from (α,β-Unsaturated) Imines or Oximes and Carbonyl Compounds
作者:Robert J. Vijn、Henricus J. Arts、Richard Green、Anna M. Castelijns
DOI:10.1055/s-1994-25526
日期:——
Reaction of a variety of (α,β-unsaturated) imines or oximes with aliphatic aldehydes or cyclic ketones in the presence of a secondary amine afforded alkyl-, and/or aryl-, and/or cycloalkyl-substituted pyridines.1 To explain their formation, a hetero Diels-Alder reaction has been postulated, in which an 1-aza-1,3-butadiene reacts with an in situ generated enamine.
One-Pot Synthesis of<i>N</i>-Chloroacetyl 1-Aminoalkyl Phosphonates - Precursors of 4-Phosphono-β-Lactams
作者:Christian V. Stevens、Kristof Moonen
DOI:10.1055/s-2005-918440
日期:——
4-Phosphono-β-lactams are synthesized via a three-step sequence, including final formation of the C3-C4 bond through a phosphorus-stabilized carbanion. The chlorinated precursors can be synthesized via two different methods: a one-pot N-acylation of an aromatic imine followed by addition of a trialkyl phosphite or phosphonylation of a suitable imine followed by N-acylation in a separate reaction step. The former method was preferred because of the ease of the reaction and the good yields obtained.
Synthesis of Oxazinyl Analogues of Fosmidomycin Using RCM Methodology
作者:Christian Stevens、Sarah Van der Jeught、Nicolai Dieltiens
DOI:10.1055/s-2007-992373
日期:——
inhibition of 1-deoxy- D-xylulose 5-phosphate reductoisomerase, a key enzyme in the biosynthesis of isoprenoids through the nonmevalonate pathway. This paper describes the synthesis of a series of analogues in which the hydroxamate moiety is incorporated in a ring structure, leaving the complexation with the enzyme up to the oxygen lone pairs instead of the free hydroxyl group. The antimalarial activities
Insertion of Nitriles into Zirconocene 1-aza-1,3-diene Complexes: Chemoselective Synthesis of N-H and N-Substituted Pyrroles
作者:Shasha Yu、Meijun Xiong、Xin Xie、Yuanhong Liu
DOI:10.1002/anie.201407221
日期:2014.10.20
insertion of nitriles into zirconocene‐1‐aza‐1,3‐diene complexes provides an efficient, chemoselective, and controllable synthesis of N‐H and N‐substitutedpyrroles upon acidic aqueous work‐up. The outcome of the reaction (that is, the formation of N‐H or N‐substitutedpyrroles) results from the different cyclization patterns, which depend on the relative stability and reactivity of the enamine–imine
Cyanoketenes. Cycloadditions of chlorocyanoketene to α,β-unsaturated imines
作者:Harold W. Moore、Gregory Hughes
DOI:10.1016/s0040-4039(00)88680-3
日期:1982.1
Chlorocyanoketene cycloadds to cinnamylideneamines to give β-lactams, δ-lactams, and pyridones. The periselectivity and stereoselectivity of these cycloadditions is markedly influenced by the N-substituent as well as the βsubstituents of the imines.