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Synthesis of 3,6-Dihydro-2H-Thiopyrans via Diffusion-Controlled Generation of Thioaldehydes as Dienophiles for [4+2] Cycloaddition

Dmitry E. Shybanov,
Ivan A. Leonov,
Yuri K. Grishin,
Nikolai V. Zyk and
Elena K. Beloglazkina

Organics2026, 7(4), 52;https://doi.org/10.3390/org7040052

11 November 2026

In this work we propose a mild, diffusion-controlled method for generating unstable thioaldehydes from stable precursors (Bunte salts or thiocyanates) using tertiary amine vapors (NEt₃ or DIPEA). The reactions were conducted in a closed system consis...

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Synthesis of 3,6-Dihydro-2H-Thiopyrans via Diffusion-Controlled Generation of Thioaldehydes as Dienophiles for [4+2] Cycloaddition