Journal
ORGANIC LETTERS
Volume 23, Issue 23, Pages 9173-9178Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.1c03483
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Funding
- National Natural Science Foundation of China [21871293, 22071264]
- National Key R&D Program of China [2018YFD0200100]
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The asymmetric isomerization/annulation cascade reaction of allylamines with allenoates was achieved under the catalysis of chiral phosphine, yielding chiral pyrroline derivatives in high yields with excellent enantioselectivities. The isomerization of N-allylamines to reactive aliphatic imines through a 1,4-proton shift, avoiding the isolation of highly unstable alkyl N-sulfonylimines, is a key step in the reaction.
Under catalysis by chiral phosphine, an asymmetric isomerization/annulation cascade reaction of allylamines with allenoates was realized. A wide range of gamma-substituted allenoates were tolerated to afford chiral pyrroline derivatives in high yields with excellent enantioselectivities. In the reaction, isomerization of readily available N-allylamines to reactive aliphatic imines through a 1,4-proton shift is a key step, which circumvents the isolation of highly unstable alkyl N-sulfonylimines.
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