A concise two step synthesis of tetrazole containing macrocycles from readily accessible starting materials is presented. The first step comprises a chemoselective amidation of amino acid derived isocyanocarboxylicacid esters with unprotected symmetrical diamines to afford diverse α-isocyano-ω-amines. In the second step, the α-isocyano-ω-amines undergo an Ugi tetrazole reaction to close the macrocycle. Advantageously, this strategy allows short access to 11-19-membered macrocycles in which substituents can be independently varied at three different positions.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5633831 | PMC |
| http://dx.doi.org/10.1021/acs.orglett.7b02319 | DOI Listing |
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