Bifunctional Chiral Dehydroalanines for Peptide Coupling and Stereoselective <i>S</i>-Michael Addition
作者:Marta I. Gutiérrez-Jiménez、Carlos Aydillo、Claudio D. Navo、Alberto Avenoza、Francisco Corzana、Gonzalo Jiménez-Osés、María M. Zurbano、Jesús H. Busto、Jesús M. Peregrina
DOI:10.1021/acs.orglett.6b00840
日期:2016.6.17
A second generation of chiral bicyclic dehydroalanines easily accessible from serine has been developed. These scaffolds behaved as excellent S-Michael acceptors when tri-O-acetyl-2-acetamido-2-deoxy-1-thio-α-d-galactopyranose (abbreviated as GalNAc-α-SH) was used as a nucleophile. This addition proceeds with total chemo- and stereoselectivity, complete atom economy, quickly, and at room temperature
已经开发出易于从丝氨酸获得的第二代手性双环脱氢丙氨酸。当将三-O-乙酰基-2-乙酰氨基-2-脱氧-1-硫代-α- d-吡喃半乳糖(缩写为GalNAc-α-SH)用作亲核试剂时,这些支架表现为出色的S -Michael受体。这种添加具有完全的化学选择性和立体选择性,可以在室温下快速,完全地原子经济,从而使其成为真正的点击反应。迈克尔加合物很容易转化为小号- (2-乙酰氨基-2-脱氧-3-α- d -galactopyranosyl) -升-和- d -cysteines,这可以被认为是衍生自Tn抗原的模拟升-Ser(α - d-GalNAc- l -Ser)和d -Ser(α- d -GalNAc- d -Ser)。