Abstract Methyl 5-hydroxy-3,11-di-2-pyridyl-4,5-dihydro-1H,3H-2,6-methano-6-benz[c]azocinecarb-oxylate (-)-3 is synthesized by oxidative cyclization of an N-benzyl-4-piperidone, reduction and resolution with (-)-camphanic acid chloride.The structures of C24H23N3O3 (-)-3 and of the corresponding camphanic acid ester C34H35N3O6 (-)-5 are orthorhombic and monoclinic with space groups P212121 ((-)-3) and P21 ((-)-5). The respective cell parameters are a = 9.758(3), b = 12.815(2), c = 16.584(4) Å, Z = 4 and Dx = 1.29 g cm-3 ((-)-3) and a = 11.189(1), b = 10.591(1), c -12.84(1) Å, β = 92.53(1)°, Z = 2, Dx = 1.27 g cm-3 ((-)-5). They were refined to R (unweighed) -0.037 ((-)-3), 0.069 ((-)-5) and R (weighed) = 0.035 ((-)-3), 0.061 ((-)-5) using 965, 1722 non-equivalent reflections, respectively. The absolute configuration of (-)-3 was determined as 2S, 3R. 5R, 6R, 11 R.
Crystal structure of (1’S)-camphanic acid (25,4S)- and (2R,4S)-2-tert-butyl-4-methyl-1,3-dioxolan-4-ylmethyl ester mixed crystal, C19H30O6
