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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Chem Asian J. 2012 Mar 13;7(5):1052–1060. doi: 10.1002/asia.201101021

Scheme 8.

Scheme 8

Reagents and conditions: for 37: Ac2O (1.5 equiv), pyridine, 60 °C, 95%; for 38: benzoic acid (2.0 equiv), 2,4,6-trichlorobenzoyl chloride (2.5 equiv), Et3N (3.0 equiv), 4-DMAP (catalytic), toluene, 90%; for 39: cinnamic acid (2.0 equiv), 2,4,6,-trichlorobenzoyl chloride (2.5 equiv), Et3N (3.0 equiv), 4-DMAP (catalytic), toluene,88%.