A new route to L-carnitine (1) based on the resolution of th trimethylammonium derivative 5 is described. The enantiomeric purity of 1 is determined by 1H-NMR of its O-acetyl hydrochloride 11 using [Eu(hfc)3] as chiralshiftreagent. The optical rotation of 1 with an enantiomeric purity ≥99% is [α] =−31.3° (c = 10, H2O).
Synthesis of isomers of acetylcarnitylcholine and other carnitine derivatives
作者:Gabor Kato、E. A. Hosein
DOI:10.1139/v69-192
日期:1969.4.1
Carnitine, γ-trimethylammonium-β-hydroxy butyric acid, was synthesized from γ-chloro-β-hydroxy butyronitrile. Acetylcarnitylcholine was prepared either by the esterification of acetylcarnitine or by the acetylation of carnitylcholine.
An efficient synthesis of (R)-carnitine hydrochloride is described. The starting material is obtained by microbial resolution of (Rs)-2,3-dicholoro-1-propanol.
描述了(R)肉碱盐酸盐的有效合成。原料通过(Rs)-2,3-二胆甾-1-丙醇的微生物拆分而获得。
A high throughput screening method for the nano-crystallization of salts of organic cations
作者:Philipp P. Nievergelt、Martin Babor、Jan Čejka、Bernhard Spingler
DOI:10.1039/c8sc00783g
日期:——
broad scope of our method has been shown by challenging it with 7 very different organiccations, whose aqueous solubilities vary by a factor of almost 1000. At least one crystal structure for 6 out of 7 tested cations was determined; 4 out of the successful 6 ones had never been crystallized before. Our method is extremely attractive for high throughput salt screening, especially for active pharmaceutical