Multicomponent synthesis of dihydrobenzoxazepinones by coupling Ugi and Mitsunobu reactions
作者:Luca Banfi、Andrea Basso Giuseppe Guanti、Paulina Lecinska、Renata Riva
DOI:10.1039/b613056a
日期:——
Various dihydrobenzo[f][1,4]oxazepin-5-ones have been convergently prepared in 2–3 steps by coupling Ugi and Mitsunobu reactions. Two alternative methodologies were used: in the first one the Ugi condensation was followed by a Mitsunobu cyclization (2 steps); in the second one an intermolecular Mitsunobu reaction was followed by a deprotection step and then by an intramolecular Ugi reaction. Also a “convertible” isocyanide was used.
通过 Ugi 和 Mitsunobu 反应的耦合,通过 2-3 步聚合制备了各种二氢苯并[f][1,4]oxazepin-5-ones。使用了两种替代方法:第一种是 Ugi 缩合,然后是 Mitsunobu 环化(2 个步骤);在第二个反应中,先进行分子间 Mitsunobu 反应,然后进行脱保护步骤,然后进行分子内 Ugi 反应。还使用了“可转化的”异氰化物。