Reaction of 1,3,4-oxadiazolones with free L-<i>α</i>-amino acids: A facile synthesis of novel 3,5-disubstituted hydantoins
作者:Yasuo Saegusa、Shigeo Harada、Shigeo Nakamura
DOI:10.1002/jhet.5570270349
日期:1990.3
A series of novel 3,5-disubstituted hydantoins 3a-1 were easily synthesized in one-step from the reaction of 2-phenyl-1,3,4-oxadiazolin-5-ones 1a-h with various free L-α-amino acids 2a-e in m-cresol at 150°. An alternative route leading to the formation of 3-benzamido-5-isopropylhydantoin 3c was also developed to make clear the reaction mechanism.
cyclocarbonylation provides an efficient and direct approach for the construction of valuable 1,3,4-oxadiazole-2(3H)-ones and their derivatives. The reaction also facilitated the convenient synthesis of BMS-191011, an opener of the cloned large-conductance Ca2+-activated potassiumchannel, providing an attractive method for medicinal chemistry.