Stereocontrolled synthesis of α-d-allulofuranosides using α-selective d-fructofuranosidation reaction
作者:Akihiro Iyoshi、Yui Makura、Masakazu Tanaka、Atsushi Ueda
DOI:10.1016/j.carres.2024.109044
日期:2024.2
Stereocontrolled synthesis of rare sugar derivatives, namely α-d-allulofuranosides, was achieved using d-fructose, one of the most abundant carbohydrates in nature. The following are the key steps of the α-d-allulofuranosides’ synthesis. (1) An α-selective glycosidation reaction of 1,3,4,6-tetra-O-benzoylated d-fructofuranosyl donor to obtain α-d-fructofuranosides with 98 %–75 % isolated yields. (2)
使用自然界中最丰富的碳水化合物之一的d-果糖,实现了稀有糖衍生物(即 α- d-呋喃糖苷)的立体控制合成。以下是α- d-呋喃糖苷合成的关键步骤。 (1) 1,3,4,6-四-O-苯甲酰化d-呋喃果糖基供体进行α-选择性糖苷化反应,得到α- d-呋喃果糖苷,分离收率98%–75%。 (2) α- d-呋喃果糖苷四醇的区域选择性 1,4,6-三-O-新戊酰化反应,且 C3-羟基保持完整。 (3)C3-羟基的氧化,随后C3-羰基的立体选择性还原。伯醇、仲醇和糖可以作为糖基受体和苷元进行后续的新戊酰化和立体反转反应,得到α- d-阿洛呋喃糖苷。