HCID 53884968, compound → HCID 54375837, compound

Participants

Reaction Steps

2,2-Dimethyl-7-methoxy-3-(N-methyl-p-toluenesulphonamido)-1-[2-(tetrahydro-2-pyranyloxy)ethylidene]-1,2,3,4-tetrahydronaphthalene (151 g), dissolved in 1100 ml of dioxan is submitted to a catalytic hydrogenation at atmospheric pressure and roomtemperature, the catalyst being 10 g of 5% palladium on charcoal. After some 80 percent of the calculated amount of hydrogen has been consumed, the hydrogen uptake tends to slow down and an additional quantity of 2 g of catalyst is needed to bring the reduction to an end. The catalyst is removed by filtration and the filtrate is evaporated in vacuo. The residue does not tend to crystallize. It contains a mixture of two stereoisomers of the title product and it is applied without purification in the next synthesis.

Provenance & Evidence