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. Author manuscript; available in PMC: 2018 Aug 31.
Published in final edited form as: Carbohydr Res. 2011 Mar 23;346(12):1445–1453. doi: 10.1016/j.carres.2011.03.029

Scheme 2.

Scheme 2

Reagents and conditions: (i) (a) Br2, DCM, rt, 1 h; (b) AgOTf in toluene; collidine, DCM, −74 °C→rt, 24 h, 77%; (ii) thiourea, DCM–MeOH, 50 °C, 24 h, 76%; (iii) AgOTf in toluene; collidine, DCM, −74 °C→rt, 24 h, 53%.