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[Anhydride]

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1) Construction of optically pure tryptophans from serine derived aziridine-2-carboxylates
Kazuo Sato and Alan P. Kozikowski
Tetrahedron Letters Volume 30, Issue 31, 1989, Pages 4073-4076

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http://dx.doi.org/10.1016/S0040-4039(00)99325-0

2) Amino acid synthesis via ring opening of N-sulphonyl aziridine-2-carboxylate esters with organometallic reagents.
Jack E. Baldwin, Alan C. Spivey, Christopher J. Schofield and Joseph B. Sweeney
Tetrahedron Volume 49, Issue 28, 9 July 1993, Pages 6309-6330

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http://dx.doi.org/10.1016/S0040-4020(01)87968-0

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