Stereoselective Synthesis of Natural and Non-natural Thomsen-nouveau Antigens and Hydrazide Derivatives
作者:Ahmad Ali Shaik、Sharmeen Nishat、Peter R. Andreana
DOI:10.1021/acs.orglett.5b00512
日期:2015.6.5
A selective glycosylation strategy enabling access to all stereochemical combinations of tumor associated Thomsen-nouveau (Tn) antigen, d-GalNAc-O-Ser/Thr, has been developed. The key component for selectivity is the phthalimide-protected d- or l-amino acid acceptors which allow access to alpha- or beta-anomers in excellent yields (72-96%) and selectivity (similar to 100%) when appropriate C-2 substitution is installed. The glycoamino acid intermediates were divergently converted to Tn-based carboxylates or to hydrazides by tandem Pd-C debenzylation followed by treatment with hydrazine hydrate or hydrazine hydrate treatment alone.