Efficient stereoselective synthesis of plasmenylcholines

被引:15
作者
Rui, YJ [1 ]
Thompson, DH [1 ]
机构
[1] PURDUE UNIV, DEPT CHEM, W LAFAYETTE, IN 47907 USA
关键词
enol ethers; phosphatidylcholine; plasmenyl phospholipids; total syntheses;
D O I
10.1002/chem.19960021205
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The first practical total chemical synthesis of a plasmenylcholine (1-O-1'-(Z)-hexadecenyl-2-hexadecanoyl-sn-glycero-3-phosphocholine) with pure (Z) olefin stereochemistry is reported. Monopalmitin was doubly protected as the 3-TBDPS-2-TBDMS ethers (tert-butyldiphenylsilyl-, tert-butyldimethylsilyl-) and converted to the corresponding 1-O-1'-(Z)-hexadecenyl-2-TBDMS-3-TBDPS-glyceryl ether (by the method of ref. [43]). Clean deprotection with tetrabutylammonium fluoride in the presence of imidazole gave 1-O-1'-(Z)-hexadecenylglycerol in >90% yield. Resilylation with TBDPSCl followed by acylation of the sn-2 alcohol with palmitoyl chloride and deprotection of the resulting 3-TBDPS-2-hexadecanoyl-1-O-1'-(Z)-hexadecenylglycerol at -20 degrees C with Bu(4)NF gave 2-hexadecanoyl-1-O-1'-(Z)-hexadecenylglycerol in 86% yield. The 3-phosphocholine group was attached by phosphorylating the free hydroxyl with 2-chloro-2-oxo-1,3,2-dioxaphospholane in the presence of pyridine, instead of Et(3)N, as base to avoid acyl migration; the dioxaphospholane triester intermediate was subsequently cleaved with Me(3)N to give 1-O-1'-(Z)-hexadecenyl-2-hexadecanoyl-sn-glycero-3-phosphocholine in 18% overall yield from monopalmitin. The efficiency and flexibility of this route makes it well-suited to the preparation of a wide variety of 1-, 2-, and 3-substituted as well as isotopically labeled plasmenylcholines for biophysical and biochemical studies.
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页码:1505 / 1508
页数:4
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