J. Drouin and JM Conia Laboratoire des Carbocycles, UniversitP de Paris-Sud. B5t. L20 91405 Orsay, France ... 3-Chloro-2-enones are very versatile intermediates from which a number of 3-substituted-2-enones can be obtained (I). ... So, 3-chloro-2-cyclopentenone (I) has been used in the preparation of pyridones of pharmaceutical interest, via the 3-azido-2 cyclopentenone (21, of 3-alkyl-2-cyclopentenones useful in cyclopentane annelation (3). (A double ...
