Carbocation catalyzed carboxylic acid activation in Staudinger reaction for stereoselective synthesis of β-lactams
作者:Ankita Rai、Puneet K. Singh、Prashant Shukla、Vijai K. Rai
DOI:10.1016/j.tetlet.2016.10.012
日期:2016.11
stereoselective β-lactams has been disclosed via cyclopropenium-ion-catalyzed reaction of substituted acetic acids with aldimines under mild conditions. Products are formed in high yields (86–95%) and good diastereoselectivity within 3–4 h. The new reaction is focused on the exploration of the scope of cyclopropenium-ion catalysis and introduction of a catalytic version of one-step Staudinger reaction for β-lactam
synthesized, and the phase transitions determined using a differential scanning calorimeter and a polarizing microscope. Smectic and nematic phases have been observed for fluoro and chloroderivatives whereas bromo and iododerivatives exhibit only a smectic phase.