Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 20, Issue 16, Pages 3323-3334Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ob00309k
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Funding
- National Natural Science Foundation of China [21672137, 21971158]
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An enantioselective Mannich addition reaction of 3,5-disubstituted 4-nitroisoxazoles to beta,gamma-alkynyl-alpha-ketimino esters has been developed using an amide phosphonium salt-based catalyst. Chiral tertiary propargylic amine products were obtained with moderate to good yields and enantioselectivities.
An enantioselective Mannich addition of 3,5-disubstituted 4-nitroisoxazoles to beta,gamma-alkynyl-alpha-ketimino esters promoted by an amide phosphonium salt-based catalyst has been developed. N-Cbz-protected ketimino esters with various aryl substituents attached to the alkyne unit were reacted with a series of isoxazoles with different substitution patterns. Chiral tertiary propargylic amine products were obtained with moderate to good yields and enantioselectivities. TIPS- and cyclopropyl-substituted alkynyl ketimines were also examined in the current system and the desired products were obtained with moderate yields and enantioselectivities. The potential scalability and utility of the current protocol were demonstrated by carrying out a relatively larger scale reaction followed by further transformations.
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