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. Author manuscript; available in PMC: 2016 Mar 23.
Published in final edited form as: Org Lett. 2012 Mar 2;14(6):1616–1619. doi: 10.1021/ol300364s

Scheme 2.

Scheme 2

Late-Stage Chromene Acetal Couplinga

aConditions: (a) acetal 1a, 2 equiv of aryl boronic acid, Ni(cod)2 (10 mol %), PPh3 (30 mol %), dioxane/t-AmOH (10:1), 100 °C; see Supporting Information for further details.