Stereoselective Synthesis of (−)-(1<i>R</i>,1′<i>R</i>,5′<i>R</i>,7′<i>R</i>)-1-Hydroxy-<i>exo</i>-brevicomin and (+)-<i>exo</i>-Brevicomin from 3,4,6-Tri-<i>O</i>-acetyl-<scp>D</scp>-glucal
Stereoselective syntheses of (−)‐(1R,1′R,5′R,7′R)‐1‐hydroxy‐exo‐brevicomin (1) and (+)‐exo‐brevicomin (2) were accomplished from 3,4,6‐tri‐O‐acetyl‐D‐glucal (5; Schemes 2 and 3). Chemoselective reduction, Grignard reaction, BartonMcCombie deoxygenation, and ketalization were used as key steps.