Tian H, Holyoke CW, Fleming FF. Stereoselective Synthesis of (
E)- and (
Z)-Isocyanoalkenes.
Org Lett 2022;
24:8657-8661. [PMID:
36399331 DOI:
10.1021/acs.orglett.2c03461]
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Abstract
(E)- and (Z)-isocyanoalkenes were selectively synthesized via the sequential cross coupling of vinyl iodides with formamide, followed by dehydration. The optimal catalyst, generated in situ from CuII and trans-N,N'-dimethyl-1,2-cyclohexanediamine, rapidly coupled (E)- or (Z)-vinyl iodides with formamide, which minimized the isomerization of the resultant vinyl formamide. The method efficiently provided a range of acyclic, carbocyclic, and heterocyclic isocyanoalkenes; the versatility is illustrated with the selective, stereodivergent syntheses of the diastereomeric isocyanoalkene antibiotics, B371 and E-B371.
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