(thianthrene-S-oxide) in conjunction with TFAA (trifluoroacetic anhydride) and Brønsted acid is able to oxidize pyrroles to Δ3-pyrrol-2-ones and indoles to indolin-3-ones via a thianthrenium salt intermediate. In the case of 3-substituted pyrroles, the product isomer formed is that in which oxygenation has been introduced at the more sterically hindered position.
TTSO(
噻蒽-S-氧化物)与
TFAA(
三氟乙酸酐)和布朗斯台德酸结合,能够通过
铊盐中间体将
吡咯氧化为 Δ 3 -
吡咯-2-酮,将
吲哚氧化为
吲哚啉-3-酮。在3-取代
吡咯的情况下,形成的产物异构体是其中在空间位阻更大的位置引入氧化的产物异构体。