Improved Procedure for the Selective N-Debenzylation of Benzylamines by Diisopropyl Azodicarboxylate
作者:Jiří Kroutil、Tomáš Trnka、Miloslav Černý
DOI:10.1055/s-2004-815937
日期:——
The selective deprotection of N-benzyl group was achieved in the presence of azido, O-benzyl, and N-tosyl groups in reactions of benzylamines derived from 1,6-anhydro-β-d-glucopyranose with diisopropyl azodicarboxylate (DIAD) in THF. The key role of this solvent and the reaction pathway are presented together with proven reaction intermediates.
The regioselectivity of aziridine ringcleavage by nucleophiles (Cl−, Br−, I−, N3−, HBr) in a series of N-tosyl- and N-benzylepimino derivatives of 1,6-anhydro-β-D-hexopyranoses of D-allo, D-manno and D-galacto configurations has been studied. On treatment with halide anions, the tosylepimines 1, 3, 5 and 7 were opened trans-diaxially according to the Furst−Plattner rule. The courses of the reactions