Abstract
Optically active α,β-diamino acids are prepared under asymmetric phase-transfer reaction conditions from a glycine Schiff base and N-protected imines with a tartrate-derived diammonium salt (TaDiAS) as the phase-transfer catalyst (see scheme; Boc=tert-butoxycarbonyl). Chemoselective deprotection of the N atoms allows straightforward transformations of the α,β-diamino acid products to be carried out.
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