| 摘要 |
11-Oxa oestrogens of formula (I), which are structural analogues of the oestrogenic steroid hormones, are obtained by functionalising the C ring, producing an intermediate in which the C ring is broken resulting in a bare C-aldehyde deriv. of formula (II), removing one C atom to obtain a C-nor bare C-aldehyde, and then cyclising the C ring.
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