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
作者:KIM, SUNGGAK、LEE, PHIL HO
DOI:——
日期:——
Total Synthesis of (−)-Batrachotoxinin A: A Local-Desymmetrization Approach
作者:Yinliang Guo、Zhixian Guo、Jia-Tian Lu、Runting Fang、Si-Cong Chen、Tuoping Luo
DOI:10.1021/jacs.9b12882
日期:2020.2.26
An enantioselective total synthesis of (-)-batrachotoxinin A is accomplished based on a key photoredox coupling reac-tion and the subsequent local-desymmetrization operation. After the expedient assembly of the highly-oxidized steroid skeleton, a delicate sequence of redox manipulations was carried out to deliver a late-stage intermediate in gram scale-and ultimately (-)-batrachotoxinin A in an efficient
(-)-batrachotoxinin A 的对映选择性全合成是基于关键的光氧化还原偶联反应和随后的局部去对称化操作完成的。在高度氧化的类固醇骨架的方便组装之后,进行了一系列精细的氧化还原操作,以有效的方式提供克级规模的后期中间体 - 最终是 (-)-batrachotoxinin A。