Scheme 1. Synthesis of Hybrid Compounds 4a–d and 6a–d and (inset) Crystal Structure of 4c.
Reagents and conditions: (i) Al(OiPr)3, cyclohexanone, toluene, reflux, 12 h; (ii) 3a–d, p-TsOH, EtOH, MW, 100 °C, 15 min; (iii) PCC, CH2Cl2, rt, 24 h.
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