A new reagent for the removal of the 4-methoxybenzyl ether: application to the synthesis of unusual macrocyclic and bolaform phosphatidylcholines.
摘要:
The total synthesis of two novel polymerizable phosphatidylcholines has been accomplished using 3-(4-methoxybenzyl)-sn-glycerol 10 as starting material. Diacylation of 10 with 13-tetradecynoic acid followed by oxidative coupling of the alkynes gives the 32-membered glycerol macrocycle 17. Sequential acylation of 10 with palmitic acid and 15-hexadecynoic acid followed by oxidative coupling gives the bolaform 16, tethered at the 2-position of the glycerol. A new method for the cleavage of 4-methoxybenzyl ethers using dimethylboron bromide at -78-degrees-C in dichloromethane is described. 1,3-Diacetylenes, 1,4-dienes, and esters are stable under the experimental conditions, and the migration of acyl chains from secondary to primary positions is totally suppressed. The diacylglycerols are then efficiently converted into the corresponding phosphatidylcholines by tetrazole-catalyzed phosphitylation with 2-cyanoethyl 2-bromoethyl N,N-diisopropylamino phosphite, oxidation, and treatment with trimethylamine to simultaneously displace the bromide and eliminate the cyanoethyl group.
A new reagent for the removal of the 4-methoxybenzyl ether: application to the synthesis of unusual macrocyclic and bolaform phosphatidylcholines.
作者:Normand Hebert、Alain Beck、R. Bruce Lennox、George Just
DOI:10.1021/jo00032a033
日期:1992.3
The total synthesis of two novel polymerizable phosphatidylcholines has been accomplished using 3-(4-methoxybenzyl)-sn-glycerol 10 as starting material. Diacylation of 10 with 13-tetradecynoic acid followed by oxidative coupling of the alkynes gives the 32-membered glycerol macrocycle 17. Sequential acylation of 10 with palmitic acid and 15-hexadecynoic acid followed by oxidative coupling gives the bolaform 16, tethered at the 2-position of the glycerol. A new method for the cleavage of 4-methoxybenzyl ethers using dimethylboron bromide at -78-degrees-C in dichloromethane is described. 1,3-Diacetylenes, 1,4-dienes, and esters are stable under the experimental conditions, and the migration of acyl chains from secondary to primary positions is totally suppressed. The diacylglycerols are then efficiently converted into the corresponding phosphatidylcholines by tetrazole-catalyzed phosphitylation with 2-cyanoethyl 2-bromoethyl N,N-diisopropylamino phosphite, oxidation, and treatment with trimethylamine to simultaneously displace the bromide and eliminate the cyanoethyl group.
Spanning or Looping? The Order and Conformation of Bipolar Phospholipids in Lipid Membranes Using 2H NMR Spectroscopy
作者:L. A. Cuccia、F. Morin、A. Beck、N. Hébert、G. Just、R. B. Lennox
Solid-state 2H NMR spectroscopy was used to study and characterize the conformation and order of bolaform lipid membranes. A series of 2H-labeled bolaform phosphatidylcholines has been synthesized and their properties compared to a [D4]dimyristoylphosphatidylcholine (DMPC) and a [D8]-32 macrocyclic phosphatidylcholine. 31P NMR measurements establish that the aqueousdispersions of these lipids adopt