D. Kusch et Fp. Montforts, SYNTHESIS OF ENANTIOMERICALLY PURE HYDROXYETHYLPORPHYRINS AND THEIR TRANSFORMATION INTO OPTICALLY-ACTIVE CHLORIN DERIVATIVES .4., Liebigs Annalen, (1), 1996, pp. 83-86
The oxazaborolidine (9)-catalyzed reduction of acetylporphyrins (4) le
d to enantiomerically pure hydroxyethylporphyrins (5), which were tran
sformed into optically active chlorin derivatives (7 and 8) upon react
ion by N,N-dimethylacetamide dimethyl acetal followed by hydrogenation
. The absolute configuration of the synthesized chlorins was elucidate
d by means of their CD spectra.