ABSTRACT
Because these various groups are attached and removed under different conditions, many avenues to partially protected carbohydrate intermediates are possible. The subject has been extensively reviewed [3-6]. Extensive schemes have been worked out using allyl ethers as 0-protecting groups (Table 2) [7]. The variety in stability to acid, base, tertbutoxide anion, and Wilkinson's catalyst opens up a variety of protecting groups strategies. Common N-protective groups for amino sugars include acyl, arylidene [8], carbobenzoxyl, phthaloyl (9]; also the use of temporarily masking of an amino function as an azido group.
