for the generation of delta-substituted pyranoid sugar amino acids (SAAs) are evaluated. The first employs chiral nonracemic tert-butane sulfinamides as key reagents. Regardless of the stereochemistry of the applied sulfinamide, the product formed has a stereochemistry resembling that of a d amino acid at C7. Direct Grignard reaction on formyl-tetra-O-benzyl-beta-D-C-glucopyranoside in the second strategy
评价了产生δ-取代的
吡喃糖
氨基酸(S
AA)的两种合成策略。第一种使用手性非外消旋叔
丁烷亚磺
酰胺作为关键试剂。不管所用亚磺
酰胺的立体
化学如何,形成的产物的立体
化学都类似于C7处的ad
氨基酸的立体
化学。在第二种策略中,对甲酰基-四-O-
苄基-β-DC-
吡喃
葡萄糖苷进行直接格氏反应,随后进行Mitsunobu转化,产生l,l-二肽等排物。