Facile transformation of 1-methoxynaphthalenes to octahydrophenanthrenes application to the total synthesis of (±)-sempervirol methyl ether, (±)-sugiol methyl ether, (±)-nimbiol methyl ether, and (±)-nimbidiol dimethyl ether
general method has been developed for the synthesis of the tricyclic aromatic ketones 4,12,13 and 14 from the 1-methoxynaphthalenes 8,9,10 and 11 respectively. The transformations of the ketones 4,12,13 and 14 into the diterpene ethers (±)-sempervirol methylether (7), (±)-sugiol methylether (15), (±)-nimbiol methylether (16), and (±)-nimbidiol dimethyl ether (17) have been successfully accomplished
Influence of methoxy-and methyl-aromatic substituents on stereochemistry of the products in the acid-catalyzed cyclization of 2-(2-arylethyl)-1,3,3-trimethylcyclohexanols: stereocontrolled total synthesis of (±)-nimbidiol and (±)-nimbiol
作者:Bimal K. Banik、Sukumar Ghosh、Usha Ranjan Ghatak
DOI:10.1016/s0040-4020(01)86225-6
日期:1988.1
The distributions of the -and the -podocarpatrienes (-) and (-) in the cyclialkylation reaction of the easily accessible cyclohexanols (-) under a mild condition have been investigated. The cyclohexanol precursors having unactivated aromatic ring proceeds with high stereoselectivity leading to the respective -products, while the substrates with an electron donating methoxy or a methyl substituent with