The .beta.' lithiation of .alpha.,.beta.-unsaturated amides
作者:Peter Beak、Dale J. Kempf、Kenneth D. Wilson
DOI:10.1021/ja00302a024
日期:1985.8
La lithiation est realisee par le sec-butyl/Li dans la N,N,N',N'-tetramethyl ethylenediamine
La 锂化 est realisee par le sec-丁基/Li dans la N,N,N',N'-四甲基乙二胺
Synthesis and sensory evaluation of all stereoisomers of sedanolide
作者:Daichi Oguro、Hidenori Watanabe
DOI:10.1016/j.tet.2010.11.035
日期:2011.1
Synthesis and sensory evaluation of all stereoisomers of sedanolide (1) are described. The asymmetric synthesis was achieved with using the all stereoisomers of bromoalcohol (3) prepared by enzymatic resolution and inversion of the secondary alcohol. All four stereoisomers of 1 were obtained in high enantiomeric purities (>99% ee). Their sensory evaluation revealed that there were distinct differences
Pentacovalent oxaphosphorane chemistry in organic synthesis. 2. Total syntheses of (.+-.)-trans- and (.+-.)-cis-neocnidilides
作者:Cynthia K. McClure、Kang Yeoun Jung
DOI:10.1021/jo00007a017
日期:1991.3
Both (+/-)-trans- and (+/-)-cis-neocnidlides (1 and 2) have been synthesized via the route illustrated in Scheme III. The condensation of the 1,2-lambda-5-oxaphospholene 5b with valeraldehyde produced the highly substituted phosphonates 12s and 12a, which were transformed via an intramolecular Wadsworth-Horner-Emmons olefination reaction to the title compounds.
Total syntheses of (±)-cis- and (±)-trans-neocnidilides
作者:Surendra H. Mahadevegowda、Faiz Ahmed Khan
DOI:10.1016/j.tetlet.2014.06.007
日期:2014.7
Total syntheses of two antimicrobial natural products (+/-)-cis-neocnidilide and (+/-)-trans-neocnidilide starting from a readily preparable cyclohexa[b]-fused 5-oxabicyclo[2.1.1]hexane derivative are presented. The diastereomeric tetrahydrofuran tricarboxylate epimers obtained from a BF3 center dot OEt2 promoted Grob-type fragmentation of the oxa-bicycle derivative were converted into title natural products by employing pyridinium dichromate/acetic anhydride mediated bis-oxidative cleavage reaction. (C) 2014 Elsevier Ltd. All rights reserved.
SUZUKI, HIDEAKI;TANAKA, AKIRA;YAMASHITA, KYOHEI, AGR. AND BIOL. CHEM., 51,(1987) N 12, 3369-3373