Compounds with bridgehead nitrogen. 48—stereochemistry of the 5-methylperhydropyrido[3,2,1-i,j][3,1]-benzoxazines

Six of the eight possible diastereoisomeric 5-methylperhydropyrido3,2,1-i,j]3,1]benzoxazines have been synthesized, and the utility of the C-3 methylene proton NMR parameters J(3ax3eq) and Δ3ax3eq] in the assignment of configurations has been demonstrated.