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. Author manuscript; available in PMC: 2019 Mar 7.
Published in final edited form as: European J Org Chem. 2017 Dec 28;2018(9):1075–1096. doi: 10.1002/ejoc.201701579

Scheme 12.

Scheme 12

Loss of stereoselectivity for 3, 4-O-carbonate protected glucosyl donor. Reagents and conditions: (a) Tf2O, BSP, CH2Cl2, −60 °C, then 55, −60 °C to 0 °C.