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. Author manuscript; available in PMC: 2021 Jul 1.
Published in final edited form as: Med Res Rev. 2019 Dec 5;40(4):1440–1495. doi: 10.1002/med.21651

Scheme 1381,82: Reagents and conditions:

Scheme 1381,82:

(i) CS2, Lac.Sulfur, triethanolamine, water, reflux, 6 h; (ii) ClCH2COOH, NaOAc, absolute EtOH, reflux, 10 h, (iii) R2CHO, β-alanine, acetic acid, reflux.