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.
A novel preparative method for homo- and heteroannular conjugated dienes in decalin derivatives by the palladium-catalyzed regioselective elimination reaction of allylic carbonates under mild conditions
Homoannular conjugated dienes in decalin systems can be prepared by the palladium-catalyzed elimination reaction of α-allylic carbonates and heteroannular dienes are obtained from β-allylic carbonates.
Reaction of Pd(OAc)2 with Bu3P (1:1) in benzene or THF afforded extraordinarily active zerovalent palladium species as a pale yellow solution, the nature of which has been discussed on the basis of the significant difference in catalytic reactivity and 31P1H}-NMR features between such a catalyst and one prepared from Pd2(dba)3 and excess Bu3P.
Pd(OAc)2与Bu 3 P(1:1)在苯或THF中的反应提供了非常活泼的零价钯物质,为浅黄色溶液,其性质已基于催化反应性和这种催化剂与由Pd 2(dba)3和过量的Bu 3 P制备的催化剂之间具有31 P 1 H} -NMR特征。
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.