Proline catalyzed enantioselective synthesis of (2 S ,3 S )-3-hydroxypipecolic acid and formal synthesis of (+)-swainsonine
作者:Ravindra D. Aher、Arumugam Sudalai
DOI:10.1016/j.tetlet.2016.03.042
日期:2016.5
A short enantioselective synthesis of (2S,3S)-3-hydroxypipecolic acid (overall yield: 18.8%; 96% ee) and formalsynthesis of (+)-swainsonine (overall yield: 13.6%; 96% ee) have been described starting from commercially available acrolein. The synthetic strategy involves a high enantioselective l-proline catalyzed sequential α-amination and diastereoselective (dr > 99:1) Barbier allylation of aldehyde
A Short, Chemo-Enzymatic Synthesis of Both Enantiomers of<i>trans</i>-3-Hydroxypipecolic Acid
作者:Stefano Begliomini、Lorenzo Sernissi、Dina Scarpi、Ernesto G. Occhiato
DOI:10.1002/ejoc.201402258
日期:2014.9
A shortsynthesis of bothenantiomers of trans-3-hydroxypipecolic acid was based on the Suzuki–Miyaura reaction of a lactam-derived enol phosphate and the lipase-catalyzed kinetic resolution of the alcohol obtained by hydroboration/oxidation of the coupling product. The RuCl3-catalyzed oxidation of the heteroaryl group introduced by the Suzuki–Miyaura coupling eventually afforded, in six or seven steps
Stereoselective Total Synthesis of <i>cis</i>- and <i>trans</i>-3-Hydroxypipecolic Acid
作者:Ningning Liang、Apurba Datta
DOI:10.1021/jo051725u
日期:2005.11.1
3-Hydroxypipecolic acid, a nonproteinogenic cyclic α-amino acid, is a common structural moiety found in a large number of natural and synthetic compounds of medicinal significance. Utilizing d-serine as a chiral template, the present research describes efficient and straightforward routes to cis- and trans-3-hydroxypipecolic acids in enantiopure form. The key steps in the syntheses involve chelation-controlled
Concise Enantioselective Syntheses of (+)-L-733,060 and (2S,3S)-3-Hydroxypipecolic Acid by Cobalt(III)(salen)-Catalyzed Two-Stereocenter Hydrolytic Kinetic Resolution of Racemic Azido Epoxides
An efficient synthesis of the 2,3-disubstituted piperidines (+)-L-733,060 and (2S,3S)-3-hydroxypipecolic acid (99% ee) in high optical purity from commercially available starting materials is described. The strategy involves a cobalt-catalyzed hydrolytic kinetic resolution of a racemic azido epoxide with two stereocenters and an intramolecular reductive cyclization as key reactions.
A concise enantioselective synthesis of (2S,3S)-3-hydroxypipecolic acid via proline catalyzed α-aminooxylation of aldehydes and Pd-catalyzed ether directed aza-Claisen rearrangements
作者:Brij Bhushan Ahuja、Arumugam Sudalai
DOI:10.1016/j.tetasy.2014.11.010
日期:2015.1
An efficient approach to (2S,3S)-3-hydroxypipecolic acid with an overall yield of 10.2% and 98% ee starting from 1,5-pentanediol has been developed. The key steps employed in the synthesis are the D-proline catalyzed sequential alpha-aminooxylation/Horner-Wadsworth-Emmons olefination of an aldehyde and the Pd-catalyzed MOM-ether directed aza-Claisen rearrangement of an allylic trichloroacetimidate. (C) 2014 Elsevier Ltd. All rights reserved.