The present invention is directed to an enantioselective synthesis of 1,3,4,6,7,12b(S)-hexahydro-2H-benzo[b]furo[2,3-a]quinolizin-2-one which is an intermediate in the production of the .alpha..sub.2 -adrenergic antagonist (2R,12bS)-N-(1,3,4,6,7,12-hexahydro-2H-benzo[b]furo[2,3-a]quinolizin-2-yl) -N-methyl-2-hydroxy-ethanesulfonamide hydrochloride.
本发明涉及对1,3,4,6,7,12b(S)-六氢-2H-苯并[b]
呋喃[2,3-a]
喹啉-2-酮进行对映选择性合成,该化合物是α2-
肾上腺素受体拮抗剂(2R,12bS)-N-(1,3,4,6,7,12-六氢-2H-苯并[b]
呋喃[2,3-a]
喹啉-2-基)-N-甲基-2-羟基-
乙烷磺酰胺盐酸盐生产中的中间体。