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. Author manuscript; available in PMC: 2017 Sep 16.
Published in final edited form as: Org Lett. 2016 Sep 6;18(18):4750–4753. doi: 10.1021/acs.orglett.6b02477

Figure 3.

Figure 3

The substrate scope of the alkyne. Reactions were conducted with 1 (1.0 equiv), 4 (2.0 equiv), Cy2NMe (2.5 equiv) in 1,4-dioxane (0.2 M) at 60 °C; isolated yields of 5 are reported. For compound 5e, the reaction was performed at 80 °C.