Year 2007, Month 4 (Section Full Articles, Page 791)
New carboranecontaining amino acids and their derivatives. Crystal structures of N-protected carboranylalaninates
S. V. Timofeev, V. I. Bregadze, S. N. Osipov, I. D. Titanyuk, P. V. Petrovskii, Z. A. Starikova, I. V. Glukhov, and I. P. Beletskaya
New alanine derivatives containing both the carboranyl and trifluoromethyl groups were synthesized by the reaction of organometallic derivatives of î-carborane with methyl trifluoropyruvate imines. When using the 1R(–)-menthoxycarbonyl protecting group at the nitrogen atom, one of diastereomers was isolated and characterized. Trifluoromethylcarboranylalanine methyl esters containing different protecting groups at the nitrogen atom were studied by X-ray diffraction. Both complete and partial deprotection of the amino and carboxy groups was performed.
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