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. 2020 Jun 15;10(38):22783–22796. doi: 10.1039/d0ra04070c

Scheme 1. Reagents and conditions: (a) TMSOTf, CH2Cl2; (b) MeONa, CH3OH; (c) PivCl, pyridine; (d) (i) TMSOTf, CH2Cl2, (ii) NaOH, CH3OH; (e) (i) Ac2O, DMAP, pyridine, CH2Cl2, (ii) 10% Pd/C, H2, CH3OH–CH2Cl2; (f) (i) (COCl)2, CH2Cl2 (ii) R1R2NH, Et3N, CH2Cl2; (iii) CH3ONa, CH3OH.

Scheme 1