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. 2017 Dec 4;33(1):147–150. doi: 10.1080/14756366.2017.1404593

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© 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Scheme 2. — Reagents and conditions: (i) chloroacetyl chloride, K₂CO₃, THF, 0 °C to rt, 9a (33%), 9b (69%); (ii) NaN₃, DMF, rt, 10a (78%), 10b (77); (iii) 3, CuSO₄^.5H₂O, sodium ascorbate, AcOH, DMF/H₂O, rt, 11a (17%), 11b (59%).