| 摘要 |
<p>The invention relates to a method of preparing 1 alpha -hydroxyvitamin D or 1 alpha -hydroxy-previtamin D compounds by hydroxylating the 1 alpha -position of an adduct of a previtamin D compound with a suitable dienophile, in which adduct optionally present hydroxy group or hydroxy groups is or are protected, if desired, and after removal of the protecting group or groups, isolating the 1 alpha -hydroxyvitamin D or 1 alpha -hydroxy-previtamin D compound. The invention also relates to 1 alpha -hydroxy-previtamin D compounds. The invention further relates to an adduct of a previtamin D or tachysterol compound with a dienophile of the general formula <IMAGE> in which A' and B' are equal and represent methoxy groups or ethoxy groups, or in which A' and B' together constitute a phenylimino or o-phenylene group.</p> |
