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Assembly of linear GBS PS Ia fragments 2. Reagents and conditions: a) TMSOTf, CH2Cl2 dry, −10 °C, (β‐) 68 %; b) Me3N⋅BH3, BF3 ⋅Et2O, MeCN, 0 °C, 65 %; c) TMSOTf, CH2Cl2 dry, 0 °C, (β‐) 65 %; d) LiI, Py, 120 °C; H2NCH2CH2NH2, EtOH, 90 °C; Ac2O, Py; MeONa, MeOH; H2, Pd‐C, 33 % (over five steps); e) TFACl, Cs2CO3, CH2Cl2, 61 %; f) TMSOTf, −20 °C, CH2Cl2, (β‐) 72 %; g) PdCl2, MeOH; H2NCH2CH2NH2, EtOH, 90 °C; Ac2O, Py; MeONa, MeOH; H2, Pd‐C, 42 % (over five steps).
