A new application of the formazyl activation provided selectively protected new derivatives of both 2-deoxy-D-galactose and 2-acetamido-2-deoxy-D-galactose formazans from 6-amino-6-deoxy-D-galactose 6,4-cyclic carbamate (1) under very simple conditions. The 1H NMR spectrum of the acetylated 2-deoxy derivative 7 revealed an equilibrium between chelated and unusual non-chelated forms of the formazan
甲酰基活化的新应用提供了从6-氨基-6-脱氧-D-半乳糖6,4-选择性地保护2-脱氧-D-半乳糖和2-乙酰氨基-2-脱氧-D-半乳糖甲maz的新衍生物。在非常简单的条件下生成环状氨基甲酸酯(1)。乙酰化的2-脱氧衍生物7的1 H NMR光谱显示溶液中甲moiety部分的螯合形式和不寻常的非螯合形式之间的平衡。
Unprotected sugar phosphinimines: A facile route to cyclic carbamates of amino sugars
作者:József Kovács、István Pintér、András Messmer、Gábor Tóth