Pregnane derivatives and processes for production thereof

Details Pregnane derivatives and processes for production thereof Pregnane derivatives and processes for production thereof

1991-11-27

1994-10-25

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

540 94, 540100, 552505, 552540, 552541, 552542, 552544, 552546, 552547, C07J 700, C07J 7100

Patent

active

053590554

ABSTRACT:
There are provided pregnane derivatives represented by formula ##STR1## wherein A.sup.1 represents a hydrogen atom or a hydroxyl group, A.sup.2 represents a substituent such as a hydroxyl group when A.sup.1 represents a hydrogen atom, or A.sup.2 represents a hydrogen atom when A.sup.1 represents a hydroxyl group, or A.sup.1 and A.sup.2 are combined together to form an oxo group; D.sup.1 represents a substituent such as a hydroxyl group, and D.sup.2 represents a hydrogen atom, or D.sup.1 and D.sup.2 are combined together to form an epoxy group or a single bond; D.sup.3, D.sup.5 and D.sup.7 each represents a hydrogen atom, D.sup.4 represents a hydroxyl group, and D.sup.6 represents a substituent such as a hydroxyl group, or D.sup.3 and D.sup.4 may be combined together to form an epoxy group or a single bond, or D.sup.4 and D.sup.5 may be combined together to form a single bond, or D.sup.5 and D.sup.6 may be combined together to form an epoxy group or a single bond, or D.sup.6 and D.sup.7 may be combined together to form a single bond; and X.sup.1 and X.sup.2 each represents a lower alkoxyl group or, when combined together, they represent a lower alkylenedioxy or oxo group, and a process for their preparation.
The pregnane derivatives are useful as intermediates for synthesizing vitamin D.sub.3 derivatives having a hydroxyl group in the 1.alpha.-position.

REFERENCES:
patent: 5112998 (1992-05-01), Tsuji et al.
Yamamoto, et al., J. Am. Chem. Soc., pp. 7116-7117, vol. 108(22) 1986.

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