1072145-51-7Relevant articles and documents
Multigram synthesis of glyceollin i
Luniwal, Amarjit,Malik, Neha,Erhardt, Paul,Khupse, Rahul,Reese, Michael,Liu, Jidong,El-Dakdouki, Mohammad,Fang, Lei
, p. 1149 - 1162 (2012/01/05)
Scaled-up procedures and preparation of glyceollin I in multigram quantities are described. The synthesis features construction of a cis-fused ring system in high enantiomeric excess after Sharpless asymmetric dihydroxylation of a key intermediate that is initially produced by an intramolecular Wittig reaction to afford the requisite alkene while simultaneously forming the first ring. The overall yield is 12% after 11 steps.
Total syntheses of racemic and natural glycinol
Luniwal, Amarjit,Khupse, Rahul S.,Reese, Michael,Fang, Lei,Erhardt, Paul W.
scheme or table, p. 2072 - 2075 (2010/04/29)
Total syntheses of racemic and (-)-glycinol (1) are described. A Wittig reaction produced the isoflav-3-ene from which a Sharpless dihydroxylation introduced either the racemic or enantiomeric 6a-hydroxy group. A 5.5% overall yield of racemic material was obtained after 12 steps. A method was devised for a one-pot switch of protecting groups masking a sensitive resorcinolic para-functionality, and conditions were optimized to prompt spontaneous closure of the pterocarpanolic dihydrofuran upon subsequent exposure of its ortho-functionality. These improvements eliminated two steps and increased the overall yield to 9.8% during production of the natural enantiomer.