Robust and straightforward chemo-enzymatic enantiopure dipeptide syntheses and diketopiperazines thereof
作者:Pedro C. Pereira、Isabel W.C.E. Arends、Roger A. Sheldon
DOI:10.1016/j.tetasy.2014.04.005
日期:2014.5
successfully converted into their corresponding enantiopure diketopiperazines by chemical esterification and cyclization under alkaline conditions, in 35–43% yield. In the case of glutamic acid, the procedure yielded the diketopiperazine with an esterified side chain. Remarkably with glutamine, the amide function in the side chain was transformed into an ester moiety, resulting in the same diketopiperazine
我们已经探索朝d苯基甘二酮哌嗪类的合成路线的范围内,涉及青霉素酰基转移酶的L-氨基酸与在侧链中的官能团的酸的d-苯基甘氨酰二肽的催化形成。从丝氨酸,苏氨酸,谷氨酸,谷氨酰胺和甲硫氨酸二肽的合成中是成功的。相反,天冬氨酸,天冬酰胺和半胱氨酸仅提供痕量的二肽,而精氨酸,赖氨酸和酪氨酸则未检测到二肽。分离二肽的产率变化,从10%到76%。在碱性条件下,通过化学酯化和环化将二肽成功转化为相应的对映纯二酮哌嗪,产率为35-43%。在谷氨酸的情况下,该方法产生具有酯化侧链的二酮哌嗪。