Novel vitamin D derivatives and process for producing the same.

摘要

Vitamin D derivatives of the formula
<Chemistry id="chema01" num="0001"><Image id="ia01" he="40" wi="42" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>where R<Sub>1</Sub>, R<Sub>2</Sub> and R<Sub>3</Sub> which may be the same or different each represents a hydrogen atom or a hydroxyl group; X is an oxygen atom, the group of the formula OR<Sub>4</Sub> (where R<Sub>4</Sub> is either a hydrogen atom or a lower alkyl having 4 to 6 carbon atoms that may or may not be substituted by a hydroxyl group), or the group of the formula=N-OR<Sub>5</Sub> (where R<Sub>5</Sub> is either a hydrogen atom or a lower alkyl group having 1 to 5 carbon atoms that may or may not be substituted by a hydroxyl group, an amino group or a lower alkylamino group having 1 to 3 carbon atoms), provided that the carbon atom at 20-position is linked to X by a single bond when X is the group of the formula OR<Sub>4</Sub>, and by a double bond in other cases, and a process for preparing the derivatives are disclosed.

The derivatives have both the immunoregulating action and the ability to induce differentiation in tumor cells and hence are useful as medicines such as antiallergic agents, antirheumatic agents and antitumor agents.