发现钯催化的 1,1-二硼基-1-烯烃与芳基和烯基碘化物的交叉偶联反应立体选择性地进行,产生相应的单偶联产物,作为具有 E 构型的单个非对映异构体。初始产物与另一种芳基碘化物的第二次偶联得到立体化学纯形式的各种三芳基烯烃。这种三芳基烯烃的高度立体选择性方法允许人们在一个锅中从 1,1-二硼基-1-烯烃合成两种非对映异构体。
Highly Stereoselective Synthesis of Tetrasubstituted Acyclic All-Carbon Olefins via Enol Tosylation and Suzuki–Miyaura Coupling
作者:Beryl X. Li、Diane N. Le、Kyle A. Mack、Andrew McClory、Ngiap-Kie Lim、Theresa Cravillion、Scott Savage、Chong Han、David B. Collum、Haiming Zhang、Francis Gosselin
DOI:10.1021/jacs.7b05071
日期:2017.8.9
A highly stereocontrolled synthesis of tetrasubstituted acyclic all-carbon olefins has been developed via a stereoselective enolization and tosylate formation, followed by a palladium-catalyzed Suzuki-Miyaura cross-coupling of the tosylates and pinacol boronic esters in the presence of a Pd(OAc)2/RuPhos catalytic system. Both the enol tosylation and Suzuki-Miyaura coupling reactions tolerate an array
Catalytic Carbometalation/Cross-Coupling Sequence across Alkynyl(2-pyridyl)silanes Leading to a Diversity-Oriented Synthesis of Tamoxifen-Type Tetrasubstituted Olefins
作者:Toshiyuki Kamei、Kenichiro Itami、Jun-ichi Yoshida
DOI:10.1002/adsc.200404220
日期:2004.12
A general synthetic scheme for tamoxifen-typetetrasubstitutedolefins based on the novel Cu-catalyzed carbomagnesation acrossalkynyl(2-pyridyl)silane has been developed. A wide array of electronically and structurally diverse tetrasubstitutedolefins can be prepared in a regiocontrolled, stereocontrolled, and diversity-oriented manner. Noteworthy features are that (i) the three aryl groups, which
Diversity-Oriented Synthesis of Tamoxifen-type Tetrasubstituted Olefins
作者:Kenichiro Itami、Toshiyuki Kamei、Jun-ichi Yoshida
DOI:10.1021/ja037566i
日期:2003.12.1
A general synthetic scheme for tamoxifen-typetetrasubstitutedolefins based on the novel Cu-catalyzed carbomagnesation acrossalkynyl(2-pyridyl)silane has been developed. A wide array of electronically and structurally diverse tetrasubstitutedolefins can be prepared in a regiocontrolled, stereocontrolled, and diversity-oriented manner. Noteworthy features are that (i) the three aryl groups, which
已经开发了基于新型 Cu 催化的炔基(2-吡啶基)硅烷碳镁化反应的他莫昔芬型四取代烯烃的一般合成方案。可以以区域控制、立体控制和面向多样性的方式制备各种电子和结构不同的四取代烯烃。值得注意的特征是 (i) 被认为对抗雌激素活性很重要(必不可少)的三个芳基可以随意变化,因为它们都源于容易获得的芳基碘化物,以及 (ii) 任何立体和原则上,区域异构体可以通过简单地改变芳基碘化物的应用顺序来制备。
Stereoconvergent and -divergent Synthesis of Tetrasubstituted Alkenes by Nickel-Catalyzed Cross-Couplings
作者:Daniel Zell、Cian Kingston、Janis Jermaks、Sleight R. Smith、Natalie Seeger、Jana Wassmer、Lauren E. Sirois、Chong Han、Haiming Zhang、Matthew S. Sigman、Francis Gosselin
DOI:10.1021/jacs.1c08399
日期:2021.11.17
of enol tosylates and boronic acid esters. Either diastereomeric product was selectively accessed from a mixture of enol tosylate starting material diastereomers in a convergent reaction by judicious choice of the ligand and reaction conditions. A similar protocol also enabled a divergent synthesis of each product isomer fromdiastereomericallypure enol tosylates. Notably, high-throughput optimization
我们报告了一种通过镍催化的 Suzuki-Miyaura烯醇甲苯磺酸酯和硼酸酯的交叉偶联非对映选择性获得四取代烯烃的方法的发展。通过明智地选择配体和反应条件,在收敛反应中从烯醇甲苯磺酸酯起始材料非对映异构体的混合物中选择性地获得任一非对映异构体产物。类似的协议还能够从非对映纯烯醇甲苯磺酸盐中不同地合成每种产品异构体。值得注意的是,单膦配体的高通量优化是由海妖的化学空间分析指导的库以确保检查多种配体选择。结果的立体电子分析提供了对这种转变中反应性和选择性配体的要求的深入了解。然后在各种四取代烯烃的立体选择性合成中探索了优化催化体系的合成效用,产率高达 94%,非对映体比高达 99:1 Z / E和 93: 7 E / Z。此外,详细的计算分析和实验机制研究为影响交叉偶联选择性的潜在异构化过程的性质提供了重要见解。
Al-Hassan, Mohammed I., Synthetic Communications, 1987, vol. 17, # 12, p. 1413 - 1420