A Simple Procedure for Preparing Annulated<i>p</i>-Benzoquinones. Improved Synthesis of 1,4-Dihydro-1,4-methanonaphthalene-5,8-dione
作者:Alan P. Marchand、Sulejman Alihodzic、Rajesh Shukla
DOI:10.1080/00397919808005109
日期:1998.2
Abstract A simple and efficient two-step, one-pot synthesis of substituted 1,4-dihydro-1,4-methanonaphthalene-5,8-diones is reported. This synthesis, which utilizes readily available starting materials and inexpensive reagents, can be used to prepare 1a-1c in 70–90% overall yield. This procedure was extended successfully to prepare a more highly complex annulated p-benzoquinone i.e., 8.
A desymmetrization approach to centrally chiral unfunctionalized arenes is developed through the enantioselective de novo construction of the arene ring by oxidative [4+2]-cycloaddition of polycyclic meso-cyclohexenediones. Catalyzed by a diphenylprolinol silyl ether, this external oxidant-free protocol gives rise to diversely substituted chiral arenes with outstanding enantioselectivity (up to >99
Synthesis and base promoted intramolecular nucleophilic reaction of 8-hydroxy-1,2,3,4-tetrachloro-9,9-dimethoxy-1α,4α,4aα,6,7,8β,8aα-hexahydro-1,4-methanonaphthalene-5(1H)-one
作者:Simon G. Bott、Alan P. Marchand、Jennifer C. Bolin、Yanjun Wang、Annavajhula Durga Prasad、Dongxia Xing、L. Kathleen Talafuse、William H. Watson、Susan A. Bourne、Thomas F. Carlson
DOI:10.1007/bf01665970
日期:1995.10
Catalytic hydrogenation of two substituted hexahydro-1,4-dimethanonaphthalene-5,8-diones results in reduction of the enedione carbon-carbon double bond with concomitant reduction of only one of the two chemically equivalent C=O groups. Reaction of one partially reduced product with base results in intramolecular addition to the carbon-carbon double bond.