期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 19, 页码 7320-7325出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c03915
关键词
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资金
- EPFL (Switzerland)
- Swiss National Science Foundation [SNSF 20020-155973]
A chiral phosphoric acid-catalyzed enantioselective synthesis of C3-substituted morpholinones is reported in this study, which has important applications in organic synthesis and medicinal chemistry. The reaction can also be applied to the concise synthesis of the neurokinin-1 receptor antagonist L-742,694.
Chiral morpholinone is an important building block in organic synthesis and a pharmacophore in medicinal chemistry. However, catalytic enantioselective methods for the construction of this N,O-heterocycle remain scarce. We report herein a chiral phosphoric acid-catalyzed enantioselective synthesis of C3-substituted morpholinones from aryl/alkylglyoxals and 2-(arylamino)ethan-1-ols. The reaction proceeds through a domino [4 + 2] heteroannulation followed by a 1,2-aryl/alkyl shift of the resulting cyclic alpha-iminium hemiacetals. It represents formally an unprecedented asymmetric aza-benzilic ester rearrangement reaction. A concise synthesis of L-742,694, a neurokinin-1 receptor antagonist, featuring this reaction is documented.
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