Deuterium- and tritium-labeled d-erythro-sphingosine (1b and 1c) were prepared by an efficient approach based on a known stereoselective total synthesis. Tritium was introduced at C−1 by [3H]NaBH4 reduction in the final synthetic step to give 1c of high radiochemical purity. 1,1,3-Trideuterio-d-erythro-sphingosine (1b) was prepared similarly and showed >99·5% enantiomeric purity and a high level of
Chirality Transfer from Guanidinium Ylides to 3-Alkenyl (or 3-Alkynyl) Aziridine-2-carboxylates and Application to the Syntheses of (2<i>R</i>,3<i>S</i>)-3-Hydroxyleucinate and <scp>d</scp>-<i>e</i><i>rythro</i>-Sphingosine
作者:Wannaporn Disadee、Tsutomu Ishikawa
DOI:10.1021/jo051495j
日期:2005.11.1
Reaction of chiral guanidinium ylides with alpha,beta-unsaturated aldehydes gives 3-(alpha,beta-unsaturated) aziridine-2-carboxylates in high diastereo- and enantioselectivities (up to 93% diastereomeric excess and 98% enantiomeric excess). 3-(l-Methylvinyl)- and 3-[(E)-pentadec-1-enyllaziridine-2-carboxylates were successfully employed to prepare (2R,3S)-3-hydroxyleucinate and D-erythro-sphingosine, respectively.
SUGAWARA, TAMIO;NARISADA, MASAYUKI, CARBOHYDR. RES., 194,(1989) C. 125-138