Enantioselective synthesis of R-(+)-α and S-(−)-α-lipoic acid
作者:Subhash P Chavan、Cherukupally Praveen、G Ramakrishna、U.R Kalkote
DOI:10.1016/j.tetlet.2004.06.027
日期:2004.7
An efficient synthesis of α-lipoic acid from the readily available cis-2-butene-1,4-diol employing a Claisen orthoester rearrangement and Sharpless asymmetric dihydroxylation as the key steps, is described.
Stereochemical control of yeast reductions: Synthesis of R-(+)-α-lipoic acid
作者:Aravamudan S. Gopalan、Hollie K. Jacobs
DOI:10.1016/s0040-4039(00)76176-4
日期:1989.1
bakers' yeast was found to be influenced by the nature of the ester group. The octyl ester was reduced in 82%ee and 77% chemical yield to the corresponding S alcohol, which was converted to R-(+)-α-lipoicacid ().
Bakers' yeast reduction of alkyl 6-chloro-3-oxohexanoates: synthesis of (R)-(+)-α-lipoic acid
作者:Aravamudan S. Gopalan、Hollie K. Jacobs
DOI:10.1039/p19900001897
日期:——
their reduction with bakers' yeast studied. The enantioselectivity of these reductions was found to be influenced by the nature of the ester alkoxy substituent. The ethyl ester was reduced to the (3R)-6-chloro-3-hydroxy-hexanoate (49% yield, 30% e.e.) while the octyl ester gave the (3S)-6-chloro-3-hydroxyhexanoate (62% yield, 90% e.e.). The latter product was then converted into (R)-(+)-α-lipoic acid