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. Author manuscript; available in PMC: 2014 Jun 24.
Published in final edited form as: Tetrahedron. 2013 Apr 15;69(25):5205–5220. doi: 10.1016/j.tet.2013.04.041

Scheme 13.

Scheme 13

Differential aptitudes of diastereomers 57 and 57′ toward E2 elimination. Reagents and conditions: a) DBU, DMSO, 80 °C.