Scheme 3. General Preparation of 33, 41, 46, and 47.
Reagents and conditions: (a) see Alsabil et al.;38 (b) MgCl2, Et3N, (CHO)n, THF, reflux, 33% for 46, 36% for 47; (c) ethyl acetoacetate, piperidine, EtOH, reflux, 89%.
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