Abstract
Chrysophaentin A is an antimicrobial natural product isolated from the marine alga C. taylori in milligram quantity. Structurally, chrysophaentin A features a macrocyclic biaryl ether core incorporating two trisubstituted chloroalkenes at its periphery. A concise synthesis of iso- and 9-dechlorochrysophaentin A enabled by a Z-selective ring-closing metathesis (RCM) cyclization followed by an oxygen to carbon ring contraction is described. Fluorescent microscopy studies revealed 9-dechlorochrysophaentins leads to inhibition of bacterial cell wall biosynthesis by disassembly of key divisome proteins, the cornerstone to bacterial cell wall biosynthesis and division.
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