期刊
JOURNAL OF FLUORINE CHEMISTRY
卷 268, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2023.110118
关键词
Fluorine; Fluoroalkylation; Amino acid; Addition reaction; Asymmetric synthesis
A diastereoselective Mannich-type reaction of 2-alkoxy-2-fluoroacetate and N-(tert-butylsulfinyl)imines is reported, providing a straightforward route to α-alkoxy- α-fluoro- β-amino acids in good yields and moderate to high diastereoselectivities. This approach uses readily accessible starting materials and is operationally simple. The stereochemistry of the current reaction differs from that of the known addition of comparable nonfluorinated 2-alkoxycarboxylic esters to N-sulfinyl imines, suggesting an open transition state explanation.
A diastereoselective Mannich-type reaction of 2-alkoxy-2-fluoroacetate and N-(tert-butylsulfinyl)imines is reported. This protocol provides a straightforward route to & alpha;-alkoxy-& alpha;-fluoro-& beta;-amino acids in good yields and moderate to high diastereoselectivities. This approach uses readily accessible starting materials and is operationally simple. Additionally, the stereochemistry of the current reaction was different from that of the known addition of comparable nonfluorinated 2-alkoxycarboxylic esters to N-sulfinyl imines. An open transition state (rather than a closed one) is proposed to explain the stereochemical outcome.
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