The short step access to the possible intermediate for the synthesis of halenaquinone and halenaquinol of the dihydrofuranfused tetracyclic ring core (7) using the intramolecular [4 + 2] cycloaddition reaction of the o-quinodimethane, generated from 6, as the key step is described.
A strategy for the synthesis of the furan-fused tetracyclic core of halenaquinol and halenaquinone was explored through a modelstudy. The synthesis involved the intramolecular [4+2] cycloaddition reaction of the o-quinodimethane, generated from benzocyclobutene as the key step.
Regioselective bond cleavage and coordination effects in the reduction of some acetals with lithium in ammonia
作者:A.D. Abell、R.A. Massy-Westropp
DOI:10.1016/s0040-4020(01)96640-2
日期:1985.1
Some benzylic-type acetals possessing the 2,8-dioxa-bicyclo [3.2.1]octane ring system are cleaved in a regioselective manner when treated with lithium in ammonia. The results f rom various reductions implicate coordination of lithium as a significant factor involved in reduction mechanisms.