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. Author manuscript; available in PMC: 2010 Jun 27.
Published in final edited form as: Tetrahedron. 2009 Jun 27;65(26):5001–5012. doi: 10.1016/j.tet.2009.03.078

Figure 2. Scope of Asymmetric Ynamide-[2 + 2 + 2] Cycloadditions.

Figure 2

[a] The dr was determined using 1H/13C NMR. [b] Isolated yields. [c] The ee was determined using chiral HPLC [CHIRALCEL OD-H; Size: 250 × 4.6 mm]; eluent: i-PrOH in hexanes. [d](R)-Xylyl-BINAP was used.