Liu J, Tang J, Chen J, Ge T, Zhao X, Xu J, Gong P, Hou Y. Stereoselective Synthesis of Substituted (
Z)-
N-Allyl Sulfonamides via a Palladium-Catalyzed Three-Component Tandem Reaction.
J Org Chem 2023;
88:4162-4171. [PMID:
36971317 DOI:
10.1021/acs.joc.2c02661]
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Abstract
This paper reports the efficient synthesis of substituted (Z)-N-allyl sulfonamides via a palladium-catalyzed three-component tandem reaction of N-buta-2,3-dienyl sulfonamides with iodides and sulfonyl hydrazide or sulfinic acid sodium salt as nucleophiles. Pd(PPh3)4 (2.5 mol %), K2CO3, and THF were used as the optimal catalyst, base, and solvent, respectively. The substituted (Z)-N-allyl sulfonamides were obtained in a 30-83% overall yield. Mechanistic investigations revealed that the formation of the single (Z)-isomer was controlled by the formation of a six-membered palladacycle intermediate.
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