Asymmetric synthesis based on chiral diamines having pyrrolidine ring
作者:Teruaki Mukaiyama
DOI:10.1016/s0040-4020(01)93286-7
日期:——
Various highly stereoselective asymmetric reactions based on chiral diamines having pyrrolidine ring are described. Some of these reactions have been successfully applied to the syntheses of natural products.
A convenient synthetic method for the marine antibiotic (−)-malyngolide and its stereoisomers was accomplished from a chiral α-alkoxyketone (4), which was readily available as a chiron. Chiral quaternary carbon synthons (5a) and (5b) as the key intermediates were constructed by the chelation controlled addition of Grignard reagent to 4.The diastereomeric mixture of 5a and 5b was readily transformed into a separable mixture of lactones (7a) and (7b), each of which could be easily separated by silica-gel column chromatography. (−)-Malyngolide and its three steroisomers were obtained in optically pure form without the need for optical resolution.
Synthesis of (+)-malyngolide from (+)-tartaric acid
作者:Yuko Tokunaga、Hajime Nagano、Michio Shiota
DOI:10.1039/p19860000581
日期:——
(+)-Malyngolide (+)-(1), the antipode of natural malyngolide, was synthesized in 9 steps from dimethyl (2R,3R)-(–)-tartrate acetonide (3)via(2R)-(–)-2-nonylbutane-1,2,4-triol (8) in 5.1 % overall yield.
Natural product synthesis using π-allyltricarbonyliron lactone complexes: Synthesis of parasorbic acid, the carpenter bee pheromone and malyngolide
作者:Averil M. Horton、Steven V. Ley
DOI:10.1016/0022-328x(85)87394-0
日期:1985.4
Preparation of three δ-lactonic natural products, parasorbic acid, the carpenter bee pheromone and malyngolide has been achieved fromπ-allyltricarbonylironlactonecomplexes as the key synthetic intermediates.
Total Synthesis of (−)-Malyngolide and of Its Three Stereomers
作者:Bernd Giese、Robert Rupaner
DOI:10.1002/jlac.198719870313
日期:1987.3.24
(−)-Malyngolide (1a) and its three stereomers 1b–d are synthesized from the allylic alcohol 4 in total yields of about 10% each. The key reaction steps are Sharpless epoxidation of the allylic alcohol 4 and radical CC bond formation with the iodide 3 and methyl methacrylate (2). This radical chain reaction needs only small amounts of organotin compounds.