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. Author manuscript; available in PMC: 2008 Aug 26.
Published in final edited form as: Chem Rev. 2007 May 27;107(6):2503–2545. doi: 10.1021/cr0509556

Figure 16.

Figure 16

Addition of (salen)CrCl to the independently prepared Mukaiyama aldol product did not lead to cyclization, suggesting that the reaction proceeds through a concerted [4+2] cycloaddition pathway.