Pp. Ehrlich et al., AN EFFICIENT ENANTIOSELECTIVE SYNTHESIS OF THE D1 AGONIST 7,11B-HEXAHYDRO-2-PROPYL-3-THIA-5-AZACYCLOPENTA[C] PHENANTHRENE-9,10-DIOL (A-86929), Journal of organic chemistry, 62(9), 1997, pp. 2782-2785
yl-3-thia-5-azacyclopenta[c]phenanthrene-9,10-diol (A-86929, 1), a pot
ent selective dopamine D1 agonist, was synthesized enantioselectively
from D-aspartic acid. Key features of the 10-step synthesis are the fo
llowing: (1) there is no chromatography required; (2) formation of 15
occurs in >99% ee; (3) the electrophilic cyclization to provide the de
sired trans stereochemisty in 18 is achieved with no loss of enantiome
ric integrity.