摘要:
Condensation of 3-phenylsulfonyl-4-chlorocoumarin with tert-butyl L-pyroglutamate potassium salt followed by desulfonylation and ester-cleavage yielded the novel crystalline N-(coumarin-4-yl)-L-pyro-glutamic acid[CPYR0-0H], which being evidenced to be a versatile and reliable H-1 nmr optical purity determination agent for chiral alcohols and amines.