doi: 10.1016/0040-4039(96)00832-5.
Synthesis of Higher α-Chlorovinyl and α-Bromovinyl Amino Acids: The Amino Protecting Group Determines the Reaction Course
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- PMID: 29200438
- PMCID: PMC5708561
- DOI: 10.1016/0040-4039(96)00832-5
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Synthesis of Higher α-Chlorovinyl and α-Bromovinyl Amino Acids: The Amino Protecting Group Determines the Reaction Course
Tetrahedron Lett.
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Abstract
N-Trifluoroacetyl α-vinyl amino esters are smoothly converted to the corresponding α-chlorovinyl or α-bromovinyl amino esters through the agency of phenyselenyl chloride or phenylselenyl bromide, respectively, followed by oxidation and pyrolysis. Exclusively the (E)-extemal halovinyl isomer and the internal halovinyl isomer are observed. The amino protecting group is a critical determinant of the reaction course (alkene addition vs. 5-exo-trig-like cyclization).
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