All articles of this category A new general synthesis of 2,2-dimethyl-2 H -thiochromenes in good yield consists of the Michael addition of thiophenols to 3-methyl-2-butenoic acid, intramolecular cyclocondensation of the resultant 3-methyl-3-phenylthiobutanoic acids, reduction of the 2,2-dimethyl-4-oxothiochromenes thus obtained with sodium borohydride, and acid-catalyzed dehydration of the resultant 4-hydroxy-2,2-dimethylthiochromans.
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Tércio et al. (1987) studied this question.