Sex Pheromone of the Pine Sawfly, Macrodiprion nemoralis. Stereoselective Synthesis of the Sixteen Stereoisomers of 3,7,9-Trimethyl-2-tridecyl Acetate.
摘要:
The sixteen stereoisomers of 3,7,9-trimethyl-2-tridecyl acetate (5Ac) were prepared individually, each in over 99.5% stereochemical purity. The syntheses were based on the ring opening of a pure enantiomer of cis-3,4-dimethyl-gamma-butyrolactone using a pure stereoisomer of 1-lithio-2,4-dimethyloctane, the two stereogenic centres of which were introduced with high selectivity by alkylations of the amide enolates from the appropriate enantiomers of pseudoephedrine. (2S,3R,7R,9S)-3,7,9-Trimethyl-2-tridecyl acetate (SRRS-5Ac) has recently been found to be the major component of the female sex pheromone of Macrodiprion nemoralis (Hymenoptera: Diprionidae). A synthetic method for the preparation of a sixteen isomer mixture of 5Ac is also presented. This mixture has been found to be biologically active in field tests.
Synthesis of All Four Possible Stereoisomers of 5,9-Dimethylpentadecane, the Major Sex Pheromone Component of the Coffee Leaf Miner Moth,<i>Perileucoptera coffeella</i>
All of the four possible stereoisomers of 5,9-dimethylpentadecane, the majorsexpheromonecomponent of the coffee leaf miner moth (Perileucoptera coffeella), were synthesized by using the methyl esters of (S)- and (R)-3-hydroxy-2-methylpropanoic acid as chiral sources for the purpose of determining the stereochemistry of the pheromone.
Mori, Kenji; Wu, Jiang, Liebigs Annalen der Chemie, 1991, # 5, p. 439 - 444
作者:Mori, Kenji、Wu, Jiang
DOI:——
日期:——
Total Asymmetric Synthesis of the Potent Immunosuppressive Marine Natural Product Microcolin A
作者:Carl P. Decicco、Paul Grover
DOI:10.1021/jo952123l
日期:1996.1.1
The total asymmetric synthesis of the potent immunosuppressive compound microcolin A is reported, The synthesis establishes the absolute stereochemistry of microcolin A as C-36R, C-38R, and C-4S on the basis of the diastereoselective preparation of all four possible diastereomers of the lipid region (fragment A) and diastereoselective synthesis of fragment C starting from natural L-(S)-alanine. The strategy involves a convergent assemblage of three optically pure fragments and is amenable to chemical modifications to examine structural analogs for biological study.
MORI, KENJI;WU, JIANG, LIEBIGS ANN. CHEM.,(1991) N, C. 439-443