Synthesis of Di-, Tri-, and Tetrasulfides through Multifold Carbon−Sulfur Cross-Coupling Reactions with Indium Tri(organothiolates) in a One-Pot Procedure

Pd-catalyzed multifold (2-, 3-, and 4-fold) carbon−sulfur cross-coupling reaction of indium tri(organothiolates) with polybromonated aromatic and heteroaromatic compounds was developed in a one-pot procedure. Both 2,5-dibromopyridine and 2,6-dibromopyridine reacted with indium tri(organothiolates) (...

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Veröffentlicht in:Journal of organic chemistry 2011-02, Vol.76 (3), p.760-765
Hauptverfasser: Lee, Phil Ho, Park, Youngchul, Park, Sangkyun, Lee, Euijae, Kim, Sunggak
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Sprache:eng
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Zusammenfassung:Pd-catalyzed multifold (2-, 3-, and 4-fold) carbon−sulfur cross-coupling reaction of indium tri(organothiolates) with polybromonated aromatic and heteroaromatic compounds was developed in a one-pot procedure. Both 2,5-dibromopyridine and 2,6-dibromopyridine reacted with indium tri(organothiolates) (0.68 equiv) in the presence of 4 mol % of Pd(OAc)2, 4.2 mol % of Xantphos, and 1 equiv of diisopropylethylamine (DIPEA), producing disulfides in good to excellent yields. These results indicate that indium tri(organothiolates) transfer all three alkyl- or arylthio groups attached to indium metal to electrophilic coupling partners. Indium tri(organothiolates) derived from alkyl thiol having a low boiling point, such as n-propyl, isopropyl, and tert-butyl thiol, acted as good nucleophilic coupling partners. In addition, indium tri(arylthiolates) derived from aryl thiols possessing an electron-withdrawing or -donating group on the aromatic ring participated well in the Pd-catalyzed multifold carbon−sulfur cross-coupling reaction. 4,4′-Dibromo-1,1′-biphenyl, 9,10-dibromoanthracene, 2,4-dibromoanisole, 2,7-dibromo-9,9-dimethylfluorene, 3,4-dibromothiophene, 2,3-dibromothiophene, 2,2′-bithiophene, 1,3,5-tribromobenzene, and 1,2,4,5-tetrabromobenzene were converted smoothly to the corresponding di-, tri-, and tetrasulfides.
ISSN:0022-3263
1520-6904
DOI:10.1021/jo102441t