Abstract An efficient synthesis of d-erythro-sphingosine and-ceramide from d-xylose or d- galactose is described. A mixture of 2, 4-O-isopropylidene-d-threose and its formate, which is available in one step from 3, 5-O-isopropylidene-d-xylofuranose or 4, 6-O-isopropylidene- d-galactopyranose, was subjected to the Wittig alkenation with triphenylphosphonio-tetra- and-hexa-decylid. The resulting 1, 3-O-isopropylidenated C 18 and C 20 alkenes were ...
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![[2(S),3(R),4E]-2-azido-1,3-O-isopropylidene-4-eicosene-1,3-diol结构式](https://image.chemsrc.com/caspic/090/109518-98-1.png)
![[2(S),3(R),4E]-2-amino-1,3-O-isopropylidene-4-eicosene-1,3-diol结构式](https://image.chemsrc.com/caspic/441/109519-00-8.png)