Multi-chelation approach towards natural product-like skeletons: one-pot access to a nitrogen-containing tetracyclic framework from AlaAla dipeptide

[摘要]：Reductive transformation of the dipeptide BocAlaAlaOMe to a complex, internally charge-stabilized, natural product-like skeleton in one synthetic step is discussed. Stepwise replacement of the B-H bonds in borane by B-N or B-O resulted in incorporation of three boron atoms in a tetracyclic framework whereby one is stereogenic!

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