Synthesis of Optically Pure Cyclic Lipoidal Ammonium Salts and Evaluation of Inhibition of Protein Kinase C
作者:M. Patricia Hubieki、Richard D. Gandour、Curtis L. Ashendel
DOI:10.1021/jo961365y
日期:1996.1.1
Stereoisomeric cyclic analogues of hexadecylphosphocholine (Miltefosine) and phosphatidylcholine, (2S,4S)-, (2R,4S)-, (2R,4R)-, and (2S,4R)-2,6,6-trimethyl-2-oxo-4-pentadecyl-1,3-dioxa-6-aza-2-phosphacyclooctane bromide (2a-d), and the enantiomers (S)- and (R)-N-(2-hydroxyethyl)-N-(2-hydroxyheptadecyl)-N,N-dimethylammonium iodide ((S)-and (R)-11) were prepared in good overall yields using optically pure glyceraldehyde surrogates as the starting materials. A four-step synthesis of the key intermediates ((S)- and (R)-1-pentadecyloxirane ((S)-and (R)-3) gave overall high optical purity and chemical yields. Approaches to the synthesis of these key intermediates utilizing asymmetric dihydroxylation on 1-pentadecene gave high chemical yields but only modest optical purity. All ammonium salts inhibited protein kinase C with the following values of IC50 (mu M): 2a (105), 2b (109), 2c (121), 2d (113).