Denbinobin was made in seven steps from quinone 3. The cyclization of aldehyde 12 using P-4-tBu and the oxidation of a hindered alcohol with MnO2 were key steps. (C) 2002 Elsevier Science Ltd. All rights reserved.
A totalsynthesis of denbinobin (1) in seven steps with an overall yield of 10% is reported. This synthesis used an FeCl3-assisted cyclization of stilbene to form a phenanthrene. The poor yields of the decarboxylation and methoxylation steps were improved upon to become essentially quantitative. This scalable methodology was carried out using ordinary laboratory reagents.
Denbinobin was made in seven steps from quinone 3. The cyclization of aldehyde 12 using P-4-tBu and the oxidation of a hindered alcohol with MnO2 were key steps. (C) 2002 Elsevier Science Ltd. All rights reserved.