Corticosteroids that have an oxygen functionality at C-11 are important regulatory hormones. 2 Because of this physiological and also clinical importance, much effort has been devoted to solving the problems presented by this class of steroid^,^ especially developing efficient methods for introducing a hydr~ xyacetyl~ and an oxygen substituent5 at'2-17 and C-11 positions, respectively; such functionalities are important for steroidal physiological activity ...
![(3R,3aS,9aS,9bS)-2,3,3a,9,9a,9b-Hexahydro-3-hydroxy-3-(hydroxymethyl)-3a,6-dimethyl-1H-benz[e]indene-5,7-(4H,8H)-dione 3,1'-O-Isopropylidene Acetal Structure](https://image.chemsrc.com/caspic/446/128802-52-8.png)
