An efficient stereoselective synthesis of (2S,4S,5R)-(−)- and (2R,4R,5S)-(+)-bulgecinine
作者:Subhash P. Chavan、Cherukupally Praveen、Pallavi Sharma、U.R. Kalkote
DOI:10.1016/j.tetlet.2004.11.101
日期:2005.1
A short synthetic route to (−)-and (+)-bulgecinine, the amino acid moiety of the bulgecins was achieved from the readily available nonchiral pool starting material cis-2-butene-1,4-diol in which a Claisen orthoester rearrangement and a Sharpless asymmetric dihydroxylation were used as the key steps.
A highly convergent and efficient synthesis of (-)-microcarpalide, a 10-membered lactone displaying remarkable microfilament disrupting activity is described. Ring-closing metathesis and Sharpless asymmetric dihydroxylations are the key steps. Our strategy highlights the application of novel hydroxy lactone precursors for the stereoselective synthesis of (-)-microcarpalide. (C) 2005 Elsevier Ltd. All rights reserved.
Chirality induction and chiron approaches to enantioselective total synthesis of α-lipoic acid
作者:Subhash P. Chavan、Kailash P. Pawar、Ch. Praveen、Niteen B. Patil
DOI:10.1016/j.tet.2015.04.090
日期:2015.6
and convenient asymmetric synthesis of (R)-(+)-lipoic acid in seven steps from chiral hydroxy aldehyde with 32.5% overall yield is described. Synthesis of S and R enantiomers of α-lipoic acid from cis-1,4-butene diol derived chiral lactone is reported with 34 % overall yield. The present synthesis involves use of simple reaction conditions making it a convenient synthesis.
A concise and stereoselective synthesis of (+)- and (−)-deoxoprosophylline
作者:Subhash P. Chavan、Cherukupally Praveen
DOI:10.1016/j.tetlet.2003.10.142
日期:2004.1
An efficient synthesis of (+)- and (−)-deoxoprosophylline was accomplished from the readily available cis-2-butene-1,4-diol in which the Sharpless asymmetric dihydroxylation was used as the key step.