R. Arnaud et al., THEORETICAL APPROACH AND FIRST EXAMPLES OF N-ACYL-THIOFORMAMIDES AS DIENOPHILES IN THE DIELS-ALDER REACTION, Journal of the Chemical Society, Chemical Communications, (18), 1995, pp. 1897-1898
ab initio Calculations as well as experimental results show that the C
= S bond of a thioamide can act as a dienophile in the Diels-Alder re
action provided that the nitrogen atom is substituted by pi-acceptor g
roups.