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
Stereospecific, Flexible and Redox-Economic Asymmetric Synthesis of<i>cis</i>- and<i>trans</i>-3-Hydroxypipecolic Acids and Analogs
作者:Bing Wang、Run-Hua Liu
DOI:10.1002/ejoc.200900231
日期:2009.6
trans-3-hydroxy-L-pipecolic acids are synthesized from a common chiral intermediate 7 by a short and flexible route. The stereospecific inversion of C-3 was achieved by the formation of an oxazoline followed by acidic ring cleavage. The overall yields are 27 % and 30 %, respectively, in 12 and 10 linear steps. Several versatile chiral building blocks are also accessible by this diastereodivergent synthesis. Unlike the