Synthetic Route to Rare Isoindolones Derivatives

The isoindolone scaffold is present in many biologically active compounds. Here, we have developed a shorter and more efficient synthesis of tetrahydropyrido[2,1-a]isoindolone. The key step of this approach is a cyclization to form the γ-lactam ring under Shibasaki's conditions. Thus, tetrahydropyrido[2,1-a]isoindolone and superior analogues, namely hexahydroazepino[2,1-a]isoindolone and hexahydroazocino[2,1-a]isoindolone, have been prepared in only three steps in 39, 25, and 19 % overall yields, respectively. This novel strategy offers a shorter alternative to existing procedures.

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