这项工作解释了在无过渡金属的情况下乙硼试剂与1,3-二烯的反应性。将Na 2 CO 3(30mol%)仅添加至在MeOH中的双(频哪醇)二硼中,可以使环状和非环状的1,3-二烯进行1,4-氢硼化。电子对底物的影响保证了共轭的1,4-氢硼化与1,2-二硼化。DFT计算表明,烯丙基阴离子中间体中的电荷分布决定着1,4-氢硼化的选择性,而二烯试剂中有利的反式构型决定了对烯丙基硼酸E酯的偏爱。
Highly regioselective ring-opening of trisubstituted aziridines by sulfur-stabilised carbanions
作者:Santiago Carballares、Donald Craig、Christopher J. T. Hyland、Pengfei Lu、Tanya Mathie、Andrew J. P. White
DOI:10.1039/b815971h
日期:——
The highly regioselective, stereospecific ring-opening of trisubstituted N-tosylaziridines possessing vinyl and hydroxymethyl groups by sulfone- and sulfide-stablised carbanions is reported.
Catalytic Organocopper Chemistry from Organosiloxane Reagents
作者:Jessica R. Herron、Vincenzo Russo、Edward J. Valente、Zachary T. Ball
DOI:10.1002/chem.200901438
日期:2009.9.7
Organosilanes serve as precursors to organocopper intermediates in a copper‐catalyzed addition to vinylepoxides (see scheme). Ligand structure has a significant effect on the reactivity of the organocopper intermediate, and the catalysis proceeds without the need for a stoichiometric silane activator such as fluoride.
Preparation of 2-Iodo Allylic Alcohols from 2-Butyn-1,4-diol
作者:Douglass F. Taber、M. Inthikhab Sikkander、James F. Berry、Kevin J. Frankowski
DOI:10.1021/jo7021197
日期:2008.2.1
The conversion of 2-butyn-1,4-diol to (Z)-2,4-diiodobut-2-en-1-ol proceeded efficiently using in situ generated trimethylsilyl iodide. Coupling with Grignard reagents and other nucleophiles delivered (2Z)-2-iodo allylicalcohols. The geometry of the products was established by nOe.
Palladium Catalyzed Cyclizations of Oxime Esters with 1,2-Disubstituted Alkenes: Synthesis of Dihydropyrroles
作者:Nicholas J. Race、John F. Bower
DOI:10.1021/ol4023112
日期:2013.9.6
Pd-catalyzed cyclizations of oxime esters with 1,2-dialkylated alkenes provide an entry to chiral dihydropyrroles. Substrate and catalyst controlled strategies for selective product formation (vs alternative pyrroles) are outlined.