Reaction of pyran-2-thiones 4 with nitrosoderivatives led surprisingly to type-8 (19) adducts which proved to be isomeric with the initially expected primary Diels-Alder cycloadducts 5. Methyl 2-thioxo-2H-pyran-5-carboxylate (4f), when reacted with nitrosobenzene at -10°, led quantitatively to the thieto-oxazine intermediate 13, which turned out to be the cornerstone of the complex cycloaddition-rearrangement
吡喃-2-硫酮的反应4与导致令人惊奇的亚硝基衍生物型- 8(19被证明是同分异构体与最初的预期主要)加合物狄尔斯-阿尔德cycloadducts 5。当在-10°下与亚硝基苯反应时,2-thioxo-2 H -pyran-5-羧酸甲酯(4f)定量地导致硫代恶嗪中间体13转化为复杂的环加成重排5 的基石。8个反应途径(方案3)。差示扫描量热法,与18a 19a相同转化,被允许证明该多步重排总体上是高温放热过程,最终产物19代表沿着该反应路径的能量吸收器。
Bianchini, Claudio, Pure and Applied Chemistry, 1991, vol. 63, p. 829 - 834
作者:Bianchini, Claudio
DOI:——
日期:——
Varache-Beranger; Nuhrich; Devaux, Farmaco, Edizione Scientifica, 1987, vol. 42, # 6, p. 465 - 473
作者:Varache-Beranger、Nuhrich、Devaux
DOI:——
日期:——
Sauve, Jean-Pierre; Lozac'H, Noel, Bulletin de la Societe Chimique de France, 1980, vol. 2, # 9-10, p. 427 - 433
作者:Sauve, Jean-Pierre、Lozac'H, Noel
DOI:——
日期:——
Sauve, Jean-Pierre, Bulletin de la Societe Chimique de France, 1980, vol. 2, # 11-12, p. 582 - 587