(alpha-Chloroalkyl)thiiranes react with sodium phenolates at heating in water-alcohol mixtures furnishing phenoxymethylthiiranes, 3-phenoxythietanes (resulting from thiirane-thietane rearrangement), or their mixture. The increased polarity of solvent favors the thiirane-thietane rearrangement. 2,2-Dimethyl-3-(chloromethyl)thiirane forms an exclusion for it does not afford (phenoxymethyl)thiirane even in anhydrous ethanol. Diastereomeric erythro- and threo-(1-chloroethyl)thiiranes react stereospecifically giving 2-methyl-3-phenoxymethylthiiranes or 2-methyl-3-phenoxythietanes of trans- and cis-configuration respectively. Specific features of these reactions are discussed from the viewpoint of solvent polarity effect on the competition between formal chlorine substitution along "recyclization" mechanism or through thiirane-thietane rearrangement.
(alpha-Chloroalkyl)thiiranes react with sodium phenolates at heating in water-alcohol mixtures furnishing phenoxymethylthiiranes, 3-phenoxythietanes (resulting from thiirane-thietane rearrangement), or their mixture. The increased polarity of solvent favors the thiirane-thietane rearrangement. 2,2-Dimethyl-3-(chloromethyl)thiirane forms an exclusion for it does not afford (phenoxymethyl)thiirane even in anhydrous ethanol. Diastereomeric erythro- and threo-(1-chloroethyl)thiiranes react stereospecifically giving 2-methyl-3-phenoxymethylthiiranes or 2-methyl-3-phenoxythietanes of trans- and cis-configuration respectively. Specific features of these reactions are discussed from the viewpoint of solvent polarity effect on the competition between formal chlorine substitution along "recyclization" mechanism or through thiirane-thietane rearrangement.
作者:A. A. Tomashevskii、V. V. Sokolov、A. A. Potekhin
DOI:10.1023/a:1025592320130
日期:——
(alpha-Chloroalkyl)thiiranes react with sodium phenolates at heating in water-alcohol mixtures furnishing phenoxymethylthiiranes, 3-phenoxythietanes (resulting from thiirane-thietane rearrangement), or their mixture. The increased polarity of solvent favors the thiirane-thietane rearrangement. 2,2-Dimethyl-3-(chloromethyl)thiirane forms an exclusion for it does not afford (phenoxymethyl)thiirane even in anhydrous ethanol. Diastereomeric erythro- and threo-(1-chloroethyl)thiiranes react stereospecifically giving 2-methyl-3-phenoxymethylthiiranes or 2-methyl-3-phenoxythietanes of trans- and cis-configuration respectively. Specific features of these reactions are discussed from the viewpoint of solvent polarity effect on the competition between formal chlorine substitution along "recyclization" mechanism or through thiirane-thietane rearrangement.