作者:Jan Bergman、Göran Lidgren
DOI:10.1016/s0040-4039(01)80754-1
日期:1989.1
Trifluoroacetic anhydride (TFAA) in ether quickly (≈ 5–10 min) converted tryptophan to the crystalline 2-trifluoromethyl-5(4)-oxazolone (2) without racemization. Dissolution of optically active 2 in acetonitrile gave racemic 2, whereas treatment with hot aqueous dioxane gave the isomeric oxazolone (3). Both 2 and 3, could on heating be further isomerized to the conjugated oxazolone (4). These oxazolones
乙醚中的三氟乙酸酐(TFAA)快速(≈5-10分钟)将色氨酸转化为结晶2-三氟甲基-5(4 )-恶唑酮(2),而没有消旋作用。旋光性2在乙腈中的溶解得到外消旋2,而用热的二恶烷水溶液处理则得到异构的恶唑酮(3)。既2和3,可以在加热被进一步异构化为共轭恶唑酮(4)。这些恶唑酮是制备含色氨酸的肽的有趣起始原料。