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. 2016 Jul 8;21(7):892. doi: 10.3390/molecules21070892

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© 2016 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).

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Scheme 9 — Synthesis of lamellarin I (38) and K (39) via 1,3-dipolar cyclization of nitrones. Reagents and conditions: (1) NaBH₄, MeOH, H₂O₂, Na₂WO₃, MeOH; (2) toluene, 120 °C, 18 h; (3) AlCl₃.