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. 2018 Oct 24;4(10):eaat2166. doi: 10.1126/sciadv.aat2166

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 3 — Reagents and conditions: (f) 1.6 equiv KHMDS, THF, 65°C, 15 hours, for (S,R)-5: 78% yield, (R,R)-5: 82% yield; (g) 10.0 or 20.0 equiv NaSEt, DMF, 140°C, 16 hours, for (−)-cis-PET: 80% yield, (−)-trans-PET: 83% yield.