A New and Convenient Method for the Synthesis of Dehydroamino Acids Starting from Ethyl<b><i>N</i></b>-Boc- and<b><i>N</i></b>-<b><i>Z</i></b>-<b><i>α</i></b>-Tosylglycinates and Various Nitro Compounds
作者:Tanemasa Nagano、Hideki Kinoshita
DOI:10.1246/bcsj.73.1605
日期:2000.7
Ethyl N-Boc- and N-Z-α-tosylglycinates, which were readily available from t-butyl or benzyl carbamate, ethyl glyoxylate, and sodium p-toluenesulfinate in formic acid, were reacted with a variety of nitro compounds in the presence of a base to afford the corresponding α,β-didehydroamino acid derivatives in good yields. Eventually, it was found that the (Z)-isomer was predominantly formed in the present
N-Boc- 和 NZ-α-甲苯磺酰基甘氨酸乙酯很容易从甲酸中的氨基甲酸叔丁酯或苄酯、乙醛酸乙酯和对甲苯亚磺酸钠中获得,在碱存在下与各种硝基化合物反应以良好的收率提供相应的α,β-二脱氢氨基酸衍生物。最终,发现在本方法中主要形成(Z)-异构体。