Zhang K, Provot O, Alami M, Tran C, Hamze A. Pd-Catalyzed Coupling of
N-Tosylhydrazones with Benzylic Phosphates: Toward the Synthesis of Di- or Tri-Substituted Alkenes.
J Org Chem 2022;
87:1249-1261. [PMID:
35015524 DOI:
10.1021/acs.joc.1c02580]
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Abstract
This study shows that various di- and tri-substituted alkenes with high chemoselectivity were obtained in good to high yields by coupling N-tosylhydrazones (NTHs) with benzylic phosphates as electrophilic partners. The obtained new catalytic system consisted of PdCl2(CH3CN)2/dppp, LiOtBu as a base, and cyclopentyl methyl ether as a green solvent. In addition, we performed a gram-scale transformation using NTH derivatives and benzylic phosphates having a C sp2-Cl bond. The latter was used as a starting point for further postfunctionalization of the key intermediates.
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