Resolution of 1-arylalkylamines with 3-O-hydrogen phthalate glucofuranose derivatives: role of steric bulk in a family of resolving agents
作者:Hari Babu Mereyala、Sreenivasulu Reddy Koduru、Venkata Narasimhaji Cheemalapati
DOI:10.1016/j.tetasy.2006.01.005
日期:2006.1
The development of three new acidic resolving agents which are hydrogen plithalates of 1,2:5,6-di-O-isopropylidene-alpha-D-glucofuranose 1, 1,2:5,6-di-O-cyclohexylidene-alpha-D-glucofuranose 2 and 1,2-O-cyclohexylidene-5,6-O-diphenylmethylidene-alpha-D-glucofuranose 3 is shown for the resolution of 1-arylalkylamines 7a-k. The salts between 1, 2 and (RS)-1-arylalkylamines 7a-k selectively crystallize 1(.)(S) 7a j and 2(.)(S) 7a-h salts, allowing us to recover the corresponding bases (S) 7a-j and (S) 7a-h, respectively, in good yield and enantiomeric excess (73-95% ee). Whereas, the salts between 3 and (RS)-1-arylalkylamines 7a-c,g-i,k selectively crystallize 3-(S)-7a-c-g-i salts to recover the corresponding bases (S)-7a-c,g-i in poor enantionieric excess (4-35% ee). The difference between the resolving ability of 1 and 2 for 1-arylalkylamines 7a-h is very slight, but there is considerable difference compared to ortho-substituted 1-arylalkylamines 7i and 7j. The role of substituents on a family of resolving agents 1, 2 and 3 is also discussed to interpret their resolving ability. (c) 2006 Published by Elsevier Ltd.