DBU as a scaffold for the synthesis of [1,3]oxazolo[2 ’ ,3 ’ : 2,3]pyrimido-[1,2- a ]azepines: annulation with aromatic cyanopropargylic alcohols
作者:Olesya A. Shemyakina、Ol’ga G. Volostnykh、Anton V. Stepanov、Anastasiya G. Mal’kina、Igor A. Ushakov、Konstantin A. Apartsin、Victoriya V. Kireeva、Boris A. Trofimov
DOI:10.1016/j.mencom.2018.03.004
日期:2018.3
Organic superbase DBU, 1,8-diazabicyclo15.4.01undec-7-ene, is readily annulated with aromatic cyanopropargylic alcohols under mild conditions (CH2Cl2, 20-25 degrees C, 30 min) to afford new 3-cyanomethylideneperhydro[1,3]oxazolo[2',3':2,3]pyrimido-[1,2-a]azepines.