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. Author manuscript; available in PMC: 2021 Dec 4.
Published in final edited form as: Chemistry. 2020 Oct 22;26(68):15953–15968. doi: 10.1002/chem.202002401

Scheme 4:

Scheme 4:

Reagents and conditions: (a) NIS, TfOH, MS 4Å, CH2Cl2, −40 °C, 15 min, 72%; (b) p-TSA, CH3OH, r t, 2 h, 79%; (c) PhOCSCl, pyridine, r t, 4 h, 91%; (d) TBTH, AIBN, toluene, reflux, 4 h, 55%.