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.
An <i>in Situ</i> Approach to Nickel-Catalyzed Cycloaddition of Alkynes and 3-Azetidinones
作者:Ashish Thakur、Judah L. Evangelista、Puneet Kumar、Janis Louie
DOI:10.1021/acs.joc.5b01458
日期:2015.10.16
An efficient and convenient procedure that generates the active Ni(0) catalyst in situ from cheap, air stable Ni(II) precursors is developed for the [4 + 2]-cycloaddition of alkynes and 3-azetidinones. The reaction affords useful 3-dehydropiperidinones in comparable yields to the reported Ni(0) procedure. Additionally, the cycloaddition with 3-oxetanone afforded the 3-dehydropyranone product. Chiral 2-substituted azetidinones were also tolerated to form substituted dehydropiperidinones in high yield and enantiomeric excess.
SUBSTITUTED 3-PIPERIDONE COMPOUNDS
申请人:Louie Janis
公开号:US20130053565A1
公开(公告)日:2013-02-28
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.