Enantioselective Synthesis of 3-Deoxy-(<i>R</i>)-sphingomyelin from (<i>S</i>)-1-(4‘-Methoxyphenyl)glycerol
作者:Hoe-Sup Byun、Jason A. Sadlofsky、Robert Bittman
DOI:10.1021/jo971977y
日期:1998.4.1
N-acylation, simultaneous reduction of the triple bond and deprotection of the PMP group by Birch reduction (Li, EtNH(2)) provided 3-deoxy-N-palmitoyl-(R)-ceramide (9). Finally, phosphitylation of 9, oxidation of the cyclic phosphite with bromine, followed by in situ ring opening gave a (2-bromoethyl)phosphate ester, which on quaternization with aqueous trimethylamine afforded 3-deoxy-N-palmitoyl-(R)-sphingomyelin
由(S)-1-(4′-甲氧基苯基)-甘油(3)制备(R)-3-脱氧鞘磷脂(2)。将后者转化为对甲氧基苯基(PMP)(S)-环氧乙烷基甲基醚(5)或(R)-1-(4'-甲氧基苯基)甘油2,3-环硫酸盐(6)。在BF(3).Et(2)O存在下用十五碳五烯酸打开5,以65%的收率得到PMP(S)-2-羟基-4-十八炔基醚(7)。或者,在碘化催化亚铜的存在下,用过量的十五碳锂打开环状硫酸盐6,然后进行酸性处理,得到产率为90%的7。通过叠氮化物置换,还原和N-酰化引入酰胺基后,通过桦木还原(Li,EtNH(2))同时还原三键和PMP基团脱保护得到3-deoxy-N-palmitoyl-( R)-神经酰胺(9)。最后,9的磷酸化