Glycosylation reaction under high pressure
β Scribed by Makoto Sasaki; Yasuo Gama; Masahiko Yasumoto; Yutaka Ishigami
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- French
- Weight
- 235 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
β¦ Synopsis
Glycosylation of various alcohols with 2,3,4,6-tetra-O-benzyl-a-D-glucopyranosyl bromide (1) in the presence of hindered amines under conditions of high pressure gave a-glycosides in good yield with high selectivity. Stereocontrolled glycosylation reactions are one of the most important topics in oligosaccharide synthesis and a large number of methods have been reported.' However, there still remains a strong demand to develop simple, mild, and efficient methods for the stereoselective construction of O-glycoside bond.2
π SIMILAR VOLUMES
## Abstract For the first time, uncatalyzed, highβpressure (0.6β GPa) reactions with ketones have proven to be a powerful way to perform the threeβcomponent __Strecker__ synthesis of __Ξ±__βamino nitriles in high yields. Two types of double __Strecker__ reactions were achieved, but attempts to perfor
Phospholes ,synthesised by an improved procedure, undergo Dials-Alder reactions at high pressure but not dipolar cycloadditions to nitrile oxides (which deoxygenate) or diaxomethanes ( which can, however, trap the phosphole oxides) . Diphenylketene gives an unexpected spirophosphorane with phosphole