Efficient Generation of a Trisporoid Library by Combination of Synthesis and Biotransformation
摘要:
[GRAPHIC]Trisporic acids and their biosynthetic precursors represent a family of powerful fungal pheromones and morphogenetic factors. A highly flexible synthetic protocol is described that (i) provides rapid access to nonfunctionalized early trisporoids from beta-ionone, (ii) includes a regiospecific oxidative functionalization of beta-ionone leading to 1-acetoxy-beta-ionone giving access to functionalized trisporoids, and (iii) utilizes a biotransformation of early synthetic trisporoids by growing cells of Blakeslea trispora to prepare late trisporoids including trisporic acids. The same protocol also provides deuterium-labeled trisporoids such as trisporin B [H-2(3)]-19. Administration of [H-2(3)]-19 to growing cells of the (-)-mating type of B. trispora resulted in the formation of the labeled trisporols [H-2(3)]-20 and [H-2(3)]-21. Growing cultures containing both mating types can be used to prepare trisporic acids from early precursors.
Efficient Generation of a Trisporoid Library by Combination of Synthesis and Biotransformation
作者:Doreen Schachtschabel、Wilhelm Boland
DOI:10.1021/jo062236c
日期:2007.2.1
[GRAPHIC]Trisporic acids and their biosynthetic precursors represent a family of powerful fungal pheromones and morphogenetic factors. A highly flexible synthetic protocol is described that (i) provides rapid access to nonfunctionalized early trisporoids from beta-ionone, (ii) includes a regiospecific oxidative functionalization of beta-ionone leading to 1-acetoxy-beta-ionone giving access to functionalized trisporoids, and (iii) utilizes a biotransformation of early synthetic trisporoids by growing cells of Blakeslea trispora to prepare late trisporoids including trisporic acids. The same protocol also provides deuterium-labeled trisporoids such as trisporin B [H-2(3)]-19. Administration of [H-2(3)]-19 to growing cells of the (-)-mating type of B. trispora resulted in the formation of the labeled trisporols [H-2(3)]-20 and [H-2(3)]-21. Growing cultures containing both mating types can be used to prepare trisporic acids from early precursors.
A convenient cross-metathesis approach to trisporins
cross-metathesis is the key step. This reaction has proved to be highly regioselective, allowing the combination of α- or β-ionone derivatives having a 1,1-disustituted olefin with trisubstituted alkenes. The stereochemistry of the newly formedolefins has been established by spectroscopic means.