A Regioselective Synthesis of Novel Functionalized Organochalcogen Compounds by Chalcogenocyclofunctionalization Reactions Based on Chalcogen Halides and Natural Products |
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| Authors: | Maxim V Musalov Vladimir A Potapov Vladimir A Yakimov Maria V Musalova Arkady A Maylyan Sergey V Zinchenko Svetlana V Amosova |
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| Institution: | A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Division of The Russian Academy of Sciences, 1 Favorsky Str., 664033 Irkutsk, Russia; (M.V.M.); (V.A.Y.); (M.V.M.); (A.A.M.); (S.V.Z.); (S.V.A.) |
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| Abstract: | The regioselective synthesis of novel functionalized condensed organochalcogen compounds by chalcogenocyclofunctionalization reactions based on chalcogen halides and the natural products thymol and carvacrol has been developed. The reactions of selenium dibromide with allyl thymol and allyl carvacrol proceeded in methylene chloride at room temperature in the presence of NaHCO3 affording bis(7-isopropyl-4-methyl-2,3-dihydro-1-benzofuran-2-yl)methyl] and bis(4-isopropyl-7-methyl-2,3-dihydro-1-benzofuran-2-yl)methyl] selenides in 90–92% yield. Similar sulfides were obtained in 70–72% yields by the reaction of sulfur dichloride in chloroform under reflux. Trihalotellanes containing the same organic moieties were synthesized from allyl thymol, allyl carvacrol and tellurium tetrachloride or tetrabromide in quantitative yields. Corresponding functionalized ditellurides were prepared in 91–92% yields by the reduction of the trichlorotellanes with sodium metabisulfite in two-phase solvent system. The comparison of reactivity of sulfur, selenium and tellurium halides in chalcogenocyclofunctionalization and distinguishing features of each reaction were discussed. |
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| Keywords: | thymol carvacrol selenium dibromide tellurium tetrachloride tellurium tetrabromide sulfur dichloride |
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