| 摘要 |
Process for preparing bicyclic lactones of the formula WHEREIN G is R9, 1-hydroxyhexyl, or 1-hydroxy-cis-3-hexenyl, wherein R9 is hydrogen, alkyl of one to 12 carbon atoms, inclusive, cycloalkyl of 3 to 10 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, phenyl, or phenyl substituted with one, 2, or 3 alkyl of one to 4 carbon atoms, inclusive; wherein M is hydrogen or a blocking group; wherein R1 is hydrogen, alkyl of one to 12 carbon atoms, inclusive, cycloalkyl of 3 to 10 carbon atoms, inclusive, aralkyl of 7 to 12 carbon atoms, inclusive, phenyl, or phenyl substituted with one, 2, or 3 chloro or alkyl of one to 4 carbon atoms, inclusive, or ethyl substituted in the beta -position with 3 chloro, 2 or 3 bromo, or 1, 2, or 3 iodo; and wherein DIFFERENCE indicates attachment in alpha or beta configuration. The lactones are useful intermediates in preparing prostaglandins having pharmacological utility.
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