Unprecedented directed oxidative cross-coupling of sulfahydantoins with aldehydes via a radical sulfonate–sulfinate conversion
作者:Yoann Aubin、Evelina Colacino、Djamel Bouchouk、Isabelle Chataigner、María del Mar Sánchez、Jean Martinez、Georges Dewynter
DOI:10.1039/c2nj40294g
日期:——
An unexpected CâC cross-coupling radical oxidation involving aldehydes and glycine enolate equivalents such as activated mesyl-sulfahydantoins leading to β,βâ²-disubstituted aspartate semialdehydes (ASA) instead of the expected threonine analogues was observed and various α-substituted non-proteinogenic amino acid analogues were synthesized. A radical mechanism was envisaged and supported by DFT calculations.
观察到了一种意外的C-C交叉耦合自由基氧化反应,涉及醛类和甘氨酸烯醇化物等效物,如活化的甲磺酰-磺胺肟,导致生成β,β'-二取代的天冬氨酸半醛(ASA),而不是预期的苏氨酸类似物,并合成了各种α-取代的非蛋白质氨基酸类似物。设想了一种自由基机理,并得到了DFT计算的支持。