Manganese(iii)-mediated radical cyclisations for the (Z)-selective synthesis of exo-alkylidene pyrrolidinones and pyrrolidines
作者:Harriet A. Keane、Wilfried Hess、Jonathan W. Burton
DOI:10.1039/c2cc32382f
日期:——
The cyclisation of alkynyl amido- and amino-malonates in the presence of manganese(III) acetate gives exo-alkylidene pyrrolidinones and pyrrolidines with a preference for the (Z)-alkene product isomer.
Palladium‐Catalysed Cyclisation of
<i>N</i>
‐Alkynyl Aminomalonates
作者:Wilfried Hess、Jonathan W. Burton
DOI:10.1002/chem.201001951
日期:2010.11.2
Go around in (hetero)cycles! The palladium‐catalysed tandem cyclisation/coupling reaction of alkynyl‐ and alkenyl‐substituted aminomalonates leads to highly functionalised pyrrolidines and piperidines in good yield (see scheme). The reaction allows efficient access to a broad range of synthetically valuable building blocks.
The cyclization of terminalalkynes with homopropargylicamines in the presence of a rhodium complex as catalyst leads to the formation of (E)-3-alkylidene-1-pyrrolines. The reaction tolerates a wide range of functional groups on the terminalalkynes. The formation of a vinylidene-rhodium complex, followed by the intermolecular nucleophilic attack of a homopropargylicamine nitrogen on the α-carbon
Amino acid esters, pharmaceuticals containing them, and the use thereof
申请人:Hoechst Aktiengesellschaft
公开号:US05043346A1
公开(公告)日:1991-08-27
The invention relates to amino acid esters of the formula I ##STR1## in which n is 2 and R, R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 have the meaning indicated in the description, to a process and intermediates for the preparation thereof, to agents containing them, and the use thereof.
Synthesis of α-CN and α-CF<sub>3</sub> N-Heterocycles through Tandem Nucleophilic Additions
作者:Junbin Han、Bo Xu、Gerald B. Hammond
DOI:10.1021/ol2011902
日期:2011.7.1
Using a readily available secondary aminoalkyne as starting material, a powerful strategy was discovered to prepare precursors of biologically important unnatural cyclic aminoacids and fluorinated N-heterocycles with important ring sizes (e.g., 5-7) in a one-pot reaction using two nucleophilic additions in a tandem fashion.