1: aq. KOH 2: (heating) 3: SOCl2 4: (i) Na<Co(CO)4>, (ii) (cyclization) View Scheme

1: aq. KOH 2: (heating) 3: SOCl2 View Scheme

1: aq. KOH 2: (heating) View Scheme

1: CH(CH2CH2CH=CH2)(CO2Me)2 With sodium hydride in tetrahydrofuran 0.5 h; 2: methyl (2E)-3-phenyl-2-propenyl carbonate With tetramethylene sulfide; 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine; copper(l) iodide; di-μ-chloro-bis(η4-1,5-cyclooctadiene)diiridium in tetrahydrofuran T=20°C; 2 h;

dimethylsulfide; ozone 1.) CH2Cl2, -78 deg C; Yield given. Multistep reaction;

Yield given. Multistep reaction;

palladium diacetate; p-benozquinone in water; dimethyl sulfoxide Ambient temperatureelectrolysis was used for the oxidation;