A Ruthenium-Catalyzed C–H Activation Strategy as an Efficient Shortcut in the Total Synthesis of 6,8-Dimethoxy-1,3-dimethylisoquinoline
作者:Santiago Fonzo、Didier F. Vargas、Teodoro S. Kaufman
DOI:10.1055/s-0037-1610720
日期:2019.10
This approach, which entails a shortcut in the synthetic management of the three-carbon side chain, is an improved and more efficient route toward the natural product, which facilitated its access in just three steps and 27.3% overall yield. A short and convenient totalsynthesis of 6,8-dimethoxy-1,3-dimethylisoquinoline, employing a C–H activation/alkenylation strategy, is reported. The approach involves
Atroposelective Ni<sup>II</sup>‐Catalyzed Cross‐Coupling Reactions Enable a Deeper Understanding of Negishi Couplings: Isolation and Application of Solid Aryl Higher‐Order Zincates
作者:Damian Groß、Willem A. L. van Otterlo、Oliver Trapp、Dino Berthold
DOI:10.1002/chem.202302841
日期:2023.12
NiII-catalyzed atroposelective Negishicross-couplingreaction revealed the importance of higher-order zincates as the transmetallating active species. An easy synthesis procedure for such zincates was developed and applied to a variety of potentially useful solid monoaryl higher-order zincates. Finally, the advantages of these reagents in differentcross-couplingreactions were exemplified.
Ni II催化的原子选择性 Negishi 交叉偶联反应优化过程中的初步实验结果揭示了高阶锌酸盐作为金属转移活性物质的重要性。开发了此类锌酸盐的简单合成方法,并将其应用于各种潜在有用的固体单芳基高阶锌酸盐。最后,举例说明了这些试剂在不同交叉偶联反应中的优势。
Unprecedented Direct Asymmetric Total Syntheses of 5,8’‐Naphthylisoquinoline Alkaloids from their Fully Substituted Precursors Employing a Novel Nickel/N,N‐ligand‐Catalyzed Atroposelective Cross‐Coupling Reaction
作者:Dino Berthold、Willem A. L. van Otterlo
DOI:10.1002/chem.202302070
日期:2023.11.2
Four different 5,8’-coupled naphthylisoquinoline alkaloids have been prepared via a general and concise synthetic pathway directly from the corresponding cross-coupling reaction precursors. For the cross-coupling key step, a new Negishi cross-coupling reaction, employing a Ni/N,N-ligand-based catalyst providing the natural products in good yields and high enantiomeric purities, has been developed.
Isoquinoline alkaloids from Ancistrocladus tectorius
作者:A. Montagnac、A.Hamid A. Hadi、F. Remy、M. Païs
DOI:10.1016/0031-9422(94)00936-n
日期:1995.6
Two new alkaloids were extracted from the bark of Ancistrocladus tectorius, 6,8-dimethoxy-3-hydroxymethyl-1-methylisoquinoline and the naphthylisoquinoline, 4'-O-demethylancistrocladine, together with the known isoquinolines, 6,8-dimethoxy-1,3-dimethylisoquinoline and (S)-6,8-dimethoxy-1,3-dimethyl-3,4-dihydroisoquinoline, which, however, have never been isolated from a natural source. The structures of the new alkaloids, as well as the absolute stereochemistry of 4'-O-demethylancistrocladine were established by spectroscopic means and chemical correlations.
RIZZACASA, MARK A.;SARGENT, MELVYN V.;SKELTON, BRIAN W.;WHNE, ALLAN H., AUSTRAL. J. CHEM., 43,(1990) N, C. 79-86
作者:RIZZACASA, MARK A.、SARGENT, MELVYN V.、SKELTON, BRIAN W.、WHNE, ALLAN H.