Various N-benzyloxycarbonyl-α-dehydroamino acid methyl esters were newly synthesized by the condensation of α-oxocarboxylic acids with benzyl carbomate followed by methyl esterfication. Others were obtained by the Wittig-Horner reaction of aldehydes with diethoxyphosphinylglycine and by the base-catalyzed β-elimination of β-acetoxy or β-halo-α-amino acids.
Novel and Selective Enzymatic Hydrolysis of γ-Ester of Dimethyl α-Dehydroglutamate with α-Chymotrypsin A
作者:Chung-gi Shin、Masashi Seki、Nobuyuki Takahashi
DOI:10.1246/cl.1990.2089
日期:1990.11
Selective enzymatic hydrolysis of γ-ester of Cbz–ΔGlu (OMe)–OMe with α-chymotrypsin at pH 9 was readily achieved to give the corresponding α-half ester (Cbz–ΔGlu–OMe) along with a small amount of Cbz–ΔGlu(OMe)–OH and Cbz–ΔGlu–OH.
It was found that the selective ester hydrolysis of N-benzyloxycarbonyl-α-dehydroglutamic acid dimethyl ester [Cbz-ΔGlu (OMe)-OMe] with papain at pH 8.0 was achieved readily to give only a Cbz-ΔGlu(OMe)-OH almost quantitatively.