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. 2020 Mar 25;25(7):1497. doi: 10.3390/molecules25071497

Scheme 3.

Scheme 3

Synthetic route for compounds 11a–d. Reactions conditions: (a) K2CO3, acetone, reflux, 72 h; (b) LiOH, THF/H2O, RT, 2h; (c) H2N-OTHP, EDCI, HOBt, NMM, DMF, RT, overnight; (d) AcCl, MeOH, 0 °C, 15 min.