Chiron approach to formal synthesis of both antipodes of cis 3-hydroxypipecolic acid
摘要:
The efficient and practical formal syntheses of both enantiomers of cis 3-hydroxypipecolic acid were accomplished from cis aziridine-2-carboxylate as the common synthetic precursor. The key steps involved are stereo and regioselective aziridine ring opening, reductive cyclization and selective N-debenzylation over O-debenzylation reactions. (C) 2014 Elsevier Ltd. All rights reserved.
Chiron approach to formal synthesis of both antipodes of cis 3-hydroxypipecolic acid
作者:Subhash P. Chavan、Lalit B. Khairnar、Prakash N. Chavan、Nilesh B. Dumare、Dinesh B. Kalbhor、Rajesh G. Gonnade
DOI:10.1016/j.tetlet.2014.09.118
日期:2014.11
The efficient and practical formal syntheses of both enantiomers of cis 3-hydroxypipecolic acid were accomplished from cis aziridine-2-carboxylate as the common synthetic precursor. The key steps involved are stereo and regioselective aziridine ring opening, reductive cyclization and selective N-debenzylation over O-debenzylation reactions. (C) 2014 Elsevier Ltd. All rights reserved.
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