new method for the synthesis of quaternary α-alkenyl substituted aminoacids by the enantio- and diastereoselectiveaddition of imidazolidinone derivatives to alkynes and allenes. Further hydrolysis of the imidazolidinone products under acidic conditions afforded biologically relevant aminoacidderivatives. This method is geometry-selective (E-isomer), enantio- and diastereoselective, and products were
A new synthetic protocol of 1-arylpropyne was developed by taking advantage of 1-(diphenylphosphoryl)propyne as propyne equivalent in Sonogashira coupling: consecutive subjection of phosphorylpropyne to t-BuOK and to aryl halides in the presence of Pd and Cu catalysts afforded the corresponding 1-arylpropynes. The following olefination of the 1-arylpropyne with aldehyde provided the corresponding diarylenyne. When the enynes thus obtained were irradiated with UV light, they showed strong emission in organic solvents and in the solid states. In solution, Ph2N-substituted enynes exhibited remarkable solvatofluorochromism, and Lippert-Mataga plot analysis demonstrated that they undergo the larger polarization in the excited states than in the ground states. (C) 2016 Elsevier Ltd. All rights reserved.