Stereoselective Total Syntheses of (−)‐Flueggine A and (+)‐Virosaine B

Convergent approach: The total syntheses of (−)-flueggine A and (+)-virosaine B (see scheme) have been accomplished in a concise and convergent manner. Key steps in these approaches were relay ring-closing metathesis reactions for rapid construction of the key intermediates, and 1,3-dipolar cycloaddition reactions for the formation of the natural products.