Gamma-lactone derivatives and process of preparing same

Details Gamma-lactone derivatives and process of preparing same Gamma-lactone derivatives and process of preparing same

1989-06-23

1990-07-03

Berch, Mark L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C01J 1900, C01J 2100, C01J 5300, C01J 6300

Patent

active

049392476

ABSTRACT:
Gamma-lactone derivatives represented by the formula (I) ##STR1## wherein when R.sup.1 is methyl group, R.sup.2 is hydrogen, hydroxyl group or trifluoroacetoxyl group and R.sup.2 may combine with R.sup.3 to form a pi bond; when R.sup.1 combines with R.sup.2 to form methylene group, R.sup.3 is hydrogen; R.sup.4 and R.sup.6 are hydrogen, respectively, or may combine to form a pi bond; R.sup.5 is hydrogen or a protecting group for hydroxyl group; R.sup.7 is hydrogen or straight-chain or branched alkyl group; and St is a steroid nucleus represented by the following formula (B): ##STR2## According to the process of the present invention, the introduction of carbon chains which form polyhydroxylated steroid side chains of brassinolides or the like into steroid nucleus is carried out in one-step with the control of stereochemistry of the contiguous four acyclic chiral centers.

REFERENCES:
Kametani I, Chem Abs 105, 191498 (1986).
Kametani II, Chem Abs 107, 154592.

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