Stereocontrolled synthesis of the tetracyclic core framework of (-)-lemonomycin.

[摘要]：In a convergent approach, the advanced intermediate I (Fmoc = fluorenylmethoxycarbonyl) in a projected total synthesis of the alkaloid (-)-lemonomycin was prepd. from readily available starting materials. The key transformations were a Pictet-Spengler cyclization, a Strecker-type amino alkylation, and an N-acyliminium cyclization.

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