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• W2079496770 endingPage "8464" @default.
• W2079496770 startingPage "8456" @default.
• W2079496770 abstract "A new stereocontrolled approach to l-(carboxycyclopropyl)glycines (l-CCGs) and 3,4-methano-l-prolines, conformationally constrained analogues of l-glutamic acid and l-proline, respectively, was developed using a 3,4-didehydro-l-pyroglutamate derivative as a common chiral template. The unsaturated l-pyroglutamate derivative employed in this work is a novel chiral synthon in which the carboxyl functionality is protected as a 2,7,8-trioxabicyclo[3.2.1]octyl group (ABO ester). Stereospecific cyclopropanation of the olefin using diazomethane followed by appropriate functional group interconversion gave l-CCG-III and trans-3,4-methano-l-proline with complete stereocontrol. Synthesis of other diastereomers of l-CCG and cis-3,4-methano-l-proline was accomplished by alteration of the 3,4-methanoglutamic acid framework via carboxycyclopropanation of the olefin with sulfur ylide and subsequent Barton decarboxylation reaction of the original γ-carboxyl group included in the pyroglutamate skeleton." @default.
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• W2079496770 date "2005-08-01" @default.
• W2079496770 modified "2023-09-27" @default.
• W2079496770 title "Novel stereocontrolled approach to conformationally constrained analogues of l-glutamic acid and l-proline via stereoselective cyclopropanation of 3,4-didehydro-l-pyroglutamic ABO ester" @default.
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• W2079496770 doi "https://doi.org/10.1016/j.tet.2005.06.051" @default.
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