作者:José Carlos González、Joana Lobo-Antunes、Paulo Pérez-Lourido、Lourdes Santana、Eugenio Uriarte
DOI:10.1055/s-2002-20952
日期:——
pyrrolocoumarin 3 was synthesized in two steps from 7-amino-4-methylcoumarin by selective o-chloroacetylation at position 8 and subsequent cyclization (the Sugasawa route to indoles). Regioselective inverse electron demand Diels-Alder reaction of 3 with dimethyl 1,2,4,5-tetrazine-3,6-dicarboxylate or 3,6-bis(trifluoromethyl)-1,2,4,5-tetrazine then gave the angular pyridazinepyrrolocoumarins 4 and 5, respectively
新的 pyrrolocoumarin 3 由 7-氨基-4-甲基香豆素通过在 8 位的选择性邻氯乙酰化和随后的环化(Sugasawa 路线到吲哚)分两步合成。区域选择性逆电子需求 Diels-Alder 反应 3 与 1,2,4,5-四嗪-3,6-二羧酸二甲酯或 3,6-双(三氟甲基)-1,2,4,5-四嗪然后给出角哒嗪吡咯香豆素 4 和 5 的产率分别很高。