The carbometallation reactions of fluoroalkylated internal alkynes with various organocopper reagents derived from organolithium, Grignard, and organozinc reagents were examined. All carbocupration reactions proceeded smoothly in a highly regio- and stereo-selective manner to give the corresponding vinylcopper intermediates. The intermediates reacted with H+ smoothly, leading to the trisubstituted
Novel Approaches towards the LTD<sub>4</sub>/E<sub>4</sub> Antagonist, LY290154
作者:Alain Merschaert、Pascal Boquel、Jean-Pierre Van Hoeck、Hugo Gorissen、Alfio Borghese、Benjamin Bonnier、Anne Mockel、Freddy Napora
DOI:10.1021/op060036x
日期:2006.7.1
Several novel approaches have been investigated for the synthesis of the LTD4/E4 antagonist LY290154. Significant improvements to the discovery route were first made by using an indoline nucleophile instead of an indolyl anion in the key substitution step. An alternative approach, introducing the 7-chloroquinoline moiety in the latest stages of the synthesis was then demonstrated. Interestingly, the
已经研究了几种新颖的方法来合成LTD 4 / E 4拮抗剂LY290154。首先通过在关键取代步骤中使用二氢吲哚亲核试剂代替吲哚基阴离子对发现路线进行了重大改进。然后证明了另一种方法,在合成的最新阶段引入了7-氯喹啉部分。有趣的是,后一种方法的关键中间体也是按照Katritzky方法在一锅法中获得的。最后,证明了一种不对称合成方法,该方法相对于McKillop报告的对映选择性路线具有明显优势。
The reactivity of the highly functionalized copper, zinc reagents RCu(CN)ZnI toward 1-haloalkynes and acetylenic esters
作者:Ming Chang P. Yeh、Paul Knochel
DOI:10.1016/s0040-4039(01)80511-6
日期:1989.1
The highlyfunctionalizedorganometallics RCu(CN)ZnI 1 react efficiently with 1-haloalkynes providing polyfunctionalized alkynes in high yields. This method has been used to prepare a pheromone of the Amathes c-nigrum in 3 steps and 64% overall yield. The reagents 1 also add in the presence of an excess of Me3SiCl to acetylenic esters to afford polyfunctionalized C—silylated ethylenic esters. In the
Organozinc compounds of functionalized alkyl iodide carrying an alkoxycarbonyl, cyano or alkenyl group were prepared in high yields under mild conditions (0°C-r.t., 10min in DMF) by the reaction of iodides with an electrogenerated reactive zinc (EGZn). Cross-coupling of the organozinc compounds with various aryl halides in the presence of 5 mol% Pd(P(o-Tol)3)2Cl2 in THF gave the corresponding cross-coupled
One-Pot Synthesis of Aryl Sulfones from Organometallic Reagents and Iodonium Salts
作者:Natalie Margraf、Georg Manolikakes
DOI:10.1021/jo5027518
日期:2015.3.6
A transition-metal-free arylation of lithium, magnesium, and zinc sulfinates with diaryliodonium salts is described. The sulfinic acid salts were prepared from the reaction of the corresponding organometallic reagents and sulfur dioxide. Combination of the three single steps (preparation of the organometalliccompound, sulfinate formation, and arylation) leads to a one-pot sequence for the synthesis