Tandem Ugi MCR/Mitsunobu Cyclization as a Short, Protecting-Group-Free Route to Benzoxazinones with Four Diversity Points
作者:Luca Banfi、Andrea Basso、Lorenzo Giardini、Renata Riva、Valeria Rocca、Giuseppe Guanti
DOI:10.1002/ejoc.201001077
日期:2011.1
A tandem Ugi/Mitsunobu protocol, starting from o-aminophenols, α-hydroxy acids, amines and aldehydes gives benzo[b][1,4]oxazin-3-ones of general formula 1 in two high-yielding steps, with the introduction of up to four diversity inputs. The mildness of the methodology allows the stereospecific synthesis of enantiomerically pure products as well as the introduction of additional functional groups. The
一个串联的 Ugi/Mitsunobu 方案,从邻氨基苯酚、α-羟基酸、胺和醛开始,在两个高产步骤中得到通式 1 的苯并[b][1,4]恶嗪-3-酮,并引入最多四个分集输入。该方法的温和性允许对映异构纯产品的立体有择合成以及引入额外的官能团。整个过程也可以一锅法进行。