Jm. Hill et al., PREPARATION OF NEPLANOCIN-A FROM D-RIBOSE AND BY A CHEMOENZYMIC METHOD, Journal of the Chemical Society. Perkin transactions. I, (11), 1994, pp. 1483-1487
The carboxylic acid 6 was converted into the amine 13 en route to nepl
anocin-A 9. The same enantiomer of the amine 13 was made from D-ribose
in a 13-step synthesis.