Reactions of N-thiobenzoyl-α-amino-acids and related N-substituted thiobenzamides with trifluoroacetic anhydride
作者:G.C. Barrett
DOI:10.1016/0040-4020(78)80062-3
日期:1978.1
amides are found to undergo cyclisation in trifluoroacetic anhydride to give 5-trifluoroacetamido-thiazoles, following the same reaction path as their N-benzoyl analogues. Terminal N-thiobenzoyl dipeptides give 5-(N-2-carboxyalkyl) trifluoroacetamido-thiazoles on treatment with trifluoroacetic anhydride, and it is established that trifluoroacetic anhydride fails to cleave the amide group of terminal
通过N-硫代苯甲酰基-α-氨基酸与三氟乙酸酐的反应形成5-(2'-苯甲酰酰氧基)噻唑。经过类似处理的相应酯经过等位SO交换,得到N-苯甲酰基-α-氨基酸酯。虽然这些是在N-(2-羧基)的反应所示的差异进一步的例子thiobenzamides与他们的苯甲酰胺类似物,N进行比较α发现-硫代苯甲酰基-α-氨基酸酰胺在三氟乙酸酐中进行环化反应,生成5-三氟乙酰氨基-噻唑,遵循与它们的N-苯甲酰基类似物相同的反应路径。末端N-硫代苯甲酰基二肽经三氟乙酸酐处理后可生成5-(N-2-羧基烷基)三氟乙酰氨基-噻唑,并且确定三氟乙酸酐不能裂解末端N-硫代酰基二肽的酰胺基,因此不适合使用用于多肽的埃德曼型序列分析的试剂。