Fig. 2

Retrosynthetic analysis of cyrneine A−B and glaucopine C. PG stands for protecting group; F–C represents Friedel–Crafts; unless otherwise noted, R in structures E–J indicates hydrogen or methyl group

Retrosynthetic analysis of cyrneine A−B and glaucopine C. PG stands for protecting group; F–C represents Friedel–Crafts; unless otherwise noted, R in structures E–J indicates hydrogen or methyl group