Ambient Temperature Synthesis of High Enantiopurity <i>N</i>-Protected Peptidyl Ketones by Peptidyl Thiol Ester−Boronic Acid Cross-Coupling
作者:Hao Yang、Hao Li、Rüdiger Wittenberg、Masahiro Egi、Wenwei Huang、Lanny S. Liebeskind
DOI:10.1021/ja0658719
日期:2007.2.1
alpha-Amino acidthiol esters derived from N-protected mono-, di-, and tripeptides couple with aryl, pi-electron-rich heteroaryl, or alkenyl boronic acids in the presence of stoichiometric Cu(I) thiophene-2-carboxylate and catalytic Pd(2)(dba)(3)/triethylphosphite to generate the corresponding N-protected peptidyl ketones in good-to-excellent yields and in high enantiopurity. Triethylphosphite plays
在化学计量的 Cu(I) 噻吩-2-羧酸盐和催化作用下,衍生自 N-保护的单肽、二肽和三肽的 α-氨基酸硫羟酸酯与芳基、富含 π 电子的杂芳基或烯基硼酸偶联Pd(2)(dba)(3)/亚磷酸三乙酯生成相应的 N 保护肽基酮,产率和对映体纯度都非常好。亚磷酸三乙酯通过减轻不希望的钯催化脱羰-β-消除α-氨基硫羟酸酯,作为支持配体发挥关键作用。肽基酮的合成在室温下非碱性条件下进行,并表现出对功能的高度耐受性。
New synthetic ‘tricks’. Advantages of using triethylphosphine in some phosphorus-based reactions
作者:Fèlix Urpí、Jaume Vilarrasa
DOI:10.1016/s0040-4039(00)85021-2
日期:——
It is shown that Et3P can advantageously replace Ph3P, Bu3P, and other P(III) reagents in phosphazene reactions (amide and phthalimide formation) and disulphide-cleavage-based reactions (reduction of disulphides, thioester formation, and oxime hydrolysis).