Blockage of coordination with shift reagent by tert-butyldimethylsilylation in nuclear magnetic resonance spectroscopy and its applications to deuterium-labeled steroids.
Derivatization of a hydroxyl group into the tert-butyldimethylsilyl ether was shown to be useful for selective blockage of coordination of the substrate with the lanthanide shift reagent in 1H nuclear magnetic resonance spectroscopy. This method was conveniently applied to confirmation of the labeled position with deuterium in the dioxygenated steroids.
Stereocontrolled formation of cis and trans ring junctions in hydrindane and decalin systems by palladium-catalyzed regioselective and stereospecific hydrogenolysis of allylic formates
Both cis and trans ring junctions can be generated selectively in hydrindane, decalin, and steroid systems by the palladium-catalyzed regioselective and stereospecific hydrogenolysis of allylic formates.
Stereocontrolled formation of cis and trans ring junctions in hydrindane, decalin, and steroid systems by palladium-catalyzed regioselective and stereospecific hydrogenolysis of allylic formates
cis and trans ring junctions can be generated selectively in hydrindane, decalin and steroid systems by the palladium-catalyzed regioselective and stereospecific decarboxylation-hydrogenolysis of allylic formates. The trans junctions were formed from 3β allylic formates of decalin and steroid and 5β allylic formates of hydrindane. The corresponding 3α and 5α formates generate the cis ring junction.