Regioselective Cycloaddition of 3-Azetidinones and 3-Oxetanones with Alkynes through Nickel-Catalysed Carbon-Carbon Bond Activation
作者:Kelvin Y. T. Ho、Christophe Aïssa
DOI:10.1002/chem.201200167
日期:2012.3.19
Get in the ring! The first examples of transition‐metal‐catalysed CC bond activation of 3‐azetidinones and 3‐oxetanones are reported. In the presence of a nickel catalyst and alkynes, a regioselective and high‐yielding [4+2] cycloaddition occurs, leading to the formation of pyridinones, pyranones and eventually 4,5‐disubstituted 3‐hydroxypyridines (see scheme).
Described herein are methods for synthesizing substituted 3-piperidone compounds. Notably, substituted 3-piperidones can also be prepared in enantiopure form. The methods may allow for preparation of highly substituted piperidine cores. Also disclosed are 3-piperidone compounds and pharmaceutical compositions comprising the compounds.
Synthesis of Enantiopure Dehydropiperidinones from α-Amino Acids and Alkynes via Azetidin-3-ones
作者:Naoki Ishida、Tatsuya Yuhki、Masahiro Murakami
DOI:10.1021/ol3016447
日期:2012.8.3
Chiral dehydropiperidinones were synthesized in enantiopure form from alpha-amino acids and alkynes via azetidin-3-ones.
A Single Step Approach to Piperidines via Ni-Catalyzed β-Carbon Elimination
作者:Puneet Kumar、Janis Louie
DOI:10.1021/ol300534j
日期:2012.4.20
An easy and expeditious route to substituted piperidines is described. A Ni-phosphine complex was used as catalyst for [4 + 2] cycloaddition of 3-azetidinone and alkynes. The reaction has broad substrate scope and affords piperidines in excellent yields and excellent regioselectivity. In the reaction of an enantiopure azetidinone, complete retention of stereochemistry was observed.