in a stereoselective and quantitative reaction. Condensation of 5-azido-5-deoxy-d-glucurono-3,6-lactone (1b) withl-cysteine methyl ester followed by the reduction of the azido group yields the rigid β-turn mimetic2d in a minimum of reaction steps.
d-
葡萄糖醛酸3,6-内酯(1a)和
L-半胱氨酸在立体选择性和定量反应中形成
噻唑烷内酰胺2a。5-
叠氮基5-脱氧-d-
葡萄糖醛酸-3,6-内酯(1b)与1-半胱
氨酸甲酯的缩合,然后
叠氮基的还原,在最少的反应步骤中产生了刚性的β-转角模拟物2d。