The Dinosyl Group: A Powerful Activator for the Regioselective Alcoholysis of Aziridines
作者:Christian Stanetty、Markus K. Blaukopf、Bodo Lachmann、Christian R. Noe
DOI:10.1002/ejoc.201100358
日期:2011.6
The N-2,4-dinitrophenylsulfonyl group (dinosyl, DNs) was found to be an excellent choice for the N-activation of aziridines towards ring cleavage with primary, secondary, andsterically demanding tertiary alcohols. Alcoholysis does not need any additional catalyst and is regioselective for the less-hindered position. No racemization in the aziridine formation or cleavage step was observed, and the resulting
N-2,4-二硝基苯磺酰基(二糖基,DNs)被发现是氮丙啶的 N 活化以与伯、仲和立体要求高的叔醇发生环裂解的绝佳选择。醇解不需要任何额外的催化剂,并且对受阻较少的位置具有区域选择性。在氮丙啶形成或裂解步骤中没有观察到外消旋化,并且可以在温和条件下定量地对所得 DNs-磺酰胺进行脱保护。