Direct aromatic tert-butylation during the synthesis of thiochroman-4-ones
The synthesis of thiochroman-4-ones from thiophenols and 3-methylbut-2-enoic acid effected by methane sulphonic acid is accompanied by tert-butylation of the aromatic ring. 3-Arylthiobutanoic acids, available using β-butyrolactone, are efficiently cyclised in the same manner.
Clayton, Stephen E.,Gabbutt, Christopher D.,Hepworth, John D.,Mark Heron
p. 939 - 946
(2007/10/02)
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