Enantioselective alkylation of ketones via chiral, nonracemic lithioenamines. An asymmetric synthesis of .alpha.-alkyl and .alpha.,.alpha.'-dialkyl cyclic ketones
Stereoselective Domino Semipinacol‐Schmidt Reaction: Diastereoselective Synthesis of 7 a‐
<i>epi</i>
‐(+)‐Lepadiformine C and Formal Synthesis of 7 a‐
<i>epi</i>
‐(−)‐Lepadiformine A
作者:Manohar Puppala、Sangram Gore、Kenneth O. Eyong、Sundarababu Baskaran
DOI:10.1002/ejoc.202201490
日期:——
A TiCl4 Lewis acid-mediated domino semi-pinacol-Schmidt reaction-based approach has been developed for the diastereoselectivesynthesis of 7 a epi-lepadiformine C (+)-7 and azatricyclic core of 7 a epi-lepadiformine A (+)-8 a.
开发了一种基于TiCl 4 Lewis 酸介导的多米诺半频哪醇-施密特反应的方法,用于非对映选择性合成 7 a epi-lepadiformine C (+)- 7和 7 a epi-lepadiformine A (+)- 的氮杂三环核心8 一个。
Asymmetric synthesis of the active form of loxoprofen and its analogue
作者:Rajib Bhuniya、Samik Nanda
DOI:10.1016/j.tetasy.2011.06.019
日期:2011.5
The asymmetric synthesis of the active form of the antiinflammatory drug loxoprofen has been reported in this article. Enzymatic kinetic resolution/racemization of a substituted homo-benzylic primary alcohol with lipase-PS, asymmetric alkylation of cyclic ketones using either Enders' or Meyers' strategy followed by a stereoselective biocatalytic reduction of carbonyl group are the key reactions employed successfully to achieve the target molecule and one of its analogue. (C) 2011 Elsevier Ltd. All rights reserved.
Two new caprolactones, (R)-10-methyl-6-undecanolide (1) and (6R,10S)-10-methyl-6-dodecanolide (2), were identified in the lipid extract of a marine streptomycete (isolate B6007). Their structures were proposed on the basis of GC-MS experiments and proved by synthesis. The absolute configuration of the compounds was established by comparison of the natural and synthetic stereoisomers using chiral gas chromatography. These caprolactones show a moderate phytotoxicity and a promising activity against cancer cells with concomitant low general cytotoxicity.
LIU, CHIN;COWARD, JAMES K., J. MED. CHEM., 34,(1991) N, C. 2094-2101
作者:LIU, CHIN、COWARD, JAMES K.
DOI:——
日期:——
MEYERS A. I.; WILLIAMS D. R.; ERICKSON G. W.; WHITE S.; DRUELINGER M., J. AMER. CHEM. SOC., 1981, 103, NO 11, 3081-3087
作者:MEYERS A. I.、 WILLIAMS D. R.、 ERICKSON G. W.、 WHITE S.、 DRUELINGER M.