sodium tetrahydroborate; n-butyllithium; 2,2,6,6-tetramethylpiperidinyl-lithium; cyclohexa-1,3-diene 1.) THF, hexane, -90 deg, 5 min; 2.) THF, hexane, -90 deg C, then Rt, 30 min; 3.) THF, hexane, reflux, 60 min; 4.) THF, hexane, MeOH, 0 deg C, 30 min; Yield given. Multistep reaction;