.DELTA..sup.4,9(11),17(20) -pregnatriene-3-ones
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United States of America Patent
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Feb 16, 1993
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N/A
app pub date -
May 18, 1992
filing date -
May 23, 1991
priority date (Note) -
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Abstract
A compound of the formula ##STR1## wherein Hal is chlorine or bromine, R is selected from the group consisting of alkyl of 1 to 6 carbon atoms, aralkyl of 7 to 15 carbon atoms and a silylated group, K is a protective group selected from the group consisting of ##STR2## n is 2 or 3 and the wavy lines mean the groups may have either isomer form or are mixtures thereof which are intermediates for .DELTA..sup.4,9(11),16 -pregnatriene-3-ones.
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