[reaction: see text] (+/-)-Lysergic acid has been synthesized via an economical 8-step route from 4-bromoindole and isocinchomeronic acid without the need to protect the indole during the synthesis. Initial efforts to form the simpler 3-acylindole derivatives first and then cyclize these were unsuccessful in the cyclization step.
Ninomiya, Ichiya; Hashimoto, Chiyomi; Kiguchi, Toshiko, Journal of the Chemical Society. Perkin transactions I, 1990, p. 707 - 713
作者:Ninomiya, Ichiya、Hashimoto, Chiyomi、Kiguchi, Toshiko、Naito, Takeaki、Barton, Derek, H. R.、et al.
DOI:——
日期:——
Total Synthesis of (±)-Lysergic Acid, Lysergol, and Isolysergol by Palladium-Catalyzed Domino Cyclization of Amino Allenes Bearing a Bromoindolyl Group
The standardised procedure for dehydrogenation of indolines into indoles with phenylseleninic anhydride was successfully applied to the final steps in the totalsynthesis of ergotalkaloids.