466-77-3Relevant academic research and scientific papers
Development of a Divergent Synthetic Route to the Erythrina Alkaloids: Asymmetric Syntheses of 8-Oxo-erythrinine, Crystamidine, 8-Oxo-erythraline, and Erythraline
Umihara, Hirotatsu,Yoshino, Tomomi,Shimokawa, Jun,Kitamura, Masato,Fukuyama, Tohru
, p. 6915 - 6918 (2016/06/14)
A general synthetic methodology toward the erythrina alkaloids has been developed. Inspired by a proposed biosynthetic mechanism, the medium-sized chiral biaryl lactam was asymmetrically transformed into the common core A-D rings by a stereospecific singlet oxygen oxidation of the phenol moiety, followed by a transannular aza-Michael reaction to the dienone functionality. The late-stage manipulation of the oxidation and oxygenation states of the functional groups on the peripheral moieties enabled the flexible syntheses of the erythrina alkaloids. Then there were four: The fixed atropisomeric stereochemistry of a medium-sized biaryl intermediate was fully transferred to the central point chirality of a helical intermediate as a result of singlet oxygen oxidation and transannulation. This finding enabled the asymmetric synthesis of a common intermediate, which is amenable to a variety of oxidation-reduction transformations, thus giving rise to the first asymmetric syntheses of four erythrina alkaloids.
SYNTHESES OF ERYTHRINA AND RELATED ALKALOIDS (6) TOTAL SYNTHESIS OF ERYSOTRINE AND ERYTHRALINE
Sano, Takehiro,Toda, Jun,Tsuda, Yoshisuke
, p. 229 - 232 (2007/10/02)
An efficiently stereocontrolled synthesis of the erythrina alkaloids, erysotrine and erythraline was described.
