A Facile Approach to the Synthesis of Allylic Spiro Ethers and Lactones
作者:Ming-Chang Yeh、Yi-Chin Lee、Tsao-Ching Young
DOI:10.1055/s-2006-950294
日期:2006.11
Treatment of 3-[(alkoxycarbonyl)alkyl]-substituted conjugated cycloalkenones with diisobutylaluminum hydride at -78 °C followed by acid quenching furnishes spiro ethers, whereas the corresponding 3-(carboxyalkyl)-substituted cycloalkenones generate spiro lactones upon reaction with sodium borohydride at 30 °C followed by acid quenching.
3-[(alkoxycarbonyl)alkyl]-substituted conjugated cycloalkenones with diisobutylaluminum hydride at -78 °C and followed by acid quenching furnishes spiro ethers, 而相应的 3-(carboxyalkyl)-substituted cycloalkenones generated spiro lactones upon reaction with sodium borohydride at 30 °C and followed by acid quenching.
Enantioselective Total Synthesis of (−)-Hunterine A Enabled by a Desymmetrization/Rearrangement Strategy
作者:Elliot F. Hicks、Kengo Inoue、Brian M. Stoltz
DOI:10.1021/jacs.3c13590
日期:2024.2.21
The first enantioselective totalsynthesis of (−)-hunterine A is disclosed. Our strategy employs a catalytic asymmetric desymmetrization of a symmetrical diketone and subsequent Beckmann rearrangement to construct a 5,6-α-aminoketone. A convergent 1,2-addition joins a vinyl dianion nucleophile and the enantioenriched ketone. The endgame of the synthesis features an aza-Cope/Mannich reaction and azide-olefin
公开了 (-)-hunterine A 的第一个对映选择性全合成。我们的策略采用对称二酮的催化不对称去对称化和随后的贝克曼重排来构建 5,6-α-氨基酮。聚合 1,2-加成反应将乙烯基二价阴离子亲核试剂与对映体富集的酮连接起来。合成的最后阶段包括氮杂-Cope/曼尼希反应和叠氮-烯烃偶极环加成,以完成五环系统。通过区域选择性氮丙啶开环完成合成。
Lin, Chu-Chung; Hsia, Ket-Shang; Wu, Hsien-Jen, Journal of the Chinese Chemical Society, 1993, vol. 40, # 6, p. 587 - 592
作者:Lin, Chu-Chung、Hsia, Ket-Shang、Wu, Hsien-Jen
DOI:——
日期:——
KIM, SUNGGAK;LEE, PHIL HO, TETRAHEDRON LETT., 29,(1988) N 42, C. 5413-5416