A New Strategy for the Synthesis of Chiral β-Alkynyl Esters via Sequential Palladium and Copper Catalysis
作者:Barry M. Trost、Benjamin R. Taft、James T. Masters、Jean-Philip Lumb
DOI:10.1021/ja203171x
日期:2011.6.8
new strategy for the synthesis of chiral β-alkynyl esters which relies on sequential Pd and Cu catalysis is reported. Terminalalkynes bearing aryl, alkyl, and silyl groups can be employed without prior activation yielding a wide range of important chiral building blocks. The reaction sequence utilizes a robust Pd(II)-catalyzed hydroalkynylation of ynoates with terminalalkynes providing geometrically
Palladium(0)-Catalyzed Intermolecular Cascade Dearomatization Reaction of β-Naphthol Derivatives with Propargyl Carbonates
作者:Lu Ding、Shu-Li You
DOI:10.1021/acs.orglett.8b02681
日期:2018.10.5
A Pd(0)-catalyzed intermolecular cascade dearomatization reaction of β-naphthol derivatives with propargyl carbonates was described. In the presence of a Pd complex derived from Pd2dba3 and rac-BINAP, various spironaphthalenones were obtained in excellent yields (up to 95%) and with high chemoselectivity (C/O > 20:1) in most cases.
Asymmetric Total Synthesis of Eupalinilide E, a Promoter of Human HSPC Expansion
作者:Ramkrishna Maity、Saumen Hajra
DOI:10.1021/acs.orglett.2c01684
日期:2022.7.8
concise and scalable asymmetric total synthesis of eupalinilde E from (R)-(−)-carvone in 12 steps is reported with an overall yield of 20%. The key steps of the synthesis are a tandem Favorskii rearrangement–elimination reaction in the chromatography-free synthesis of carvone-derived 2-cyclopentene carbaldehyde and its catalyst-free stereospecific tandem allylboration–lactonization using recyclable trifluoroethanol
据报道,通过 12 个步骤从 ( R )-(-)-香芹酮合成 eupalinilde E 的简明且可扩展的不对称全合成,总产率为 20%。合成的关键步骤是在香芹酮衍生的 2-环戊烯甲醛的无色谱合成中的串联 Favorskii 重排-消除反应,及其使用可回收三氟乙醇作为促进剂和溶剂的无催化剂立体定向串联烯丙基硼化-内酯化反应,得到 β-羟甲基-α-亚甲基-γ-丁内酯。
Synthesis of 5,8-dimethoxynaphtho[2,3-c]furan-4(9H)-one
作者:Matthew J. Piggott、Dieter Wege
DOI:10.1016/j.tet.2006.01.096
日期:2006.4
The synthesis of the title compound, which shares its skeleton with a number of biologically active natural products, is described. The key steps are construction of a 3,4-disubstituted furan by a tandem Diels-Aider-retro-Diels-Alder reaction of an alkyne with 4-phenyloxazole, and an intramolecular Friedel-Crafts acylation. (c) 2006 Elsevier Ltd. All rights reserved.