Nucleophilic addition to coordinated polyenes: a novel method for the liberation of the trimethylenemethane ligand involving CC bond formation
摘要:
Reaction of (trimethylenemethane)Fe(CO)3 with carbon nucleophiles, followed by protonation yields the corresponding methallylated nucleophile in good yield. Products which incorporate carbonyl ligands are also observed.
Sub Room Temperature Differential Vapor Pressure Osmometry: A Method for the Determination of the Aggregation Number of α-Heterosubstituted Organolithium Compounds and Lithium Amides in Solution
The reactions of bis (trimethylsilyl) peroxide with alkyl, vinyl, alkynyl, aromatic and heteroaromatic anions are described. Depending on the reaction conditions, the trimethylsilyloxy derivatives can be obtained alone or together with the corresponding trimethylsilyl derivatives, which is sometimes the major product. Enolates, generated using magnesium diisopropylamide give the corresponding hydroxycarbonyl
1,4-addition of lithiated derivatives from 1,3-dithianes to α-unsaturated aldehydes : A way to δ-carbonyl aldehydes
作者:Mahmoud El-Bouz、Lya Wartski
DOI:10.1016/s0040-4039(00)78638-2
日期:1980.1
1,4-Addition of the lithiated derivatives of the 1,3-dithiane and 2-phenyl-1,3-dithiane on α-unsaturated aldehydes is performed in THF-HMPA ; this reaction could be an interesting way to δ-carbonyl aldehydes.
Three advanced intermediates corresponding to the carbon skeleton of the hennoxazoles have been prepared. Central to the strategy is the synthesis of the oxazoles prior to coupling with the other fragments and a dithiane addition to allow for the generation of diastereomers of the natural product.
作者:Richard C. Cambie、George R. Clark、Stewart R. Gallagher、Peter S. Rutledge、Martin J. Stone、Paul D. Woodgate
DOI:10.1016/0022-328x(88)83005-5
日期:1988.3
mium(0) (7), tricarbonyl[4a,5,6,7,8,8a-η)-1,2,3,4-tetrahydronaphthalene]chromium(0) (11) and (benzene)tricarbonylchromium(0) (10) were prepared and examined. Complex 7 was obtained as a mixture of diastereomers, an X-ray structural determination showing that the α-isomer possesses a near eclipsed conformation, in agreement with the conformation in solution deduced from 400 MHz 1H NMR analysis.
三羰基[8,9,11,12,13,14-η)甲基罗汉松8,11,13-trien-19-oate]铬(0)(7),三羰基[4a,5,6,7,8制备并检查了(8a-η)-1,2,3,4-四氢萘]铬(0)(11)和(苯)三羰基铬(0)(10)。获得作为非对映异构体混合物的配合物7,X射线结构测定表明α-异构体具有接近日蚀的构象,与从400MHz 1 H NMR分析推导的溶液中的构象一致。
A novel synthesis of functionalized 1,1-difluoro-1-alkenes via isolable 2,2-difluorovinylsilanes
作者:Junji Ichikawa、Yuichiro Ishibashi、Hiroki Fukui
DOI:10.1016/s0040-4039(02)02652-7
日期:2003.1
Various 1,1-difluoro-1-alkenes such as monosubstituted 1,1-difluoro-1-alkenes, 2-bromo-1,1-difluoro-1-alkenes, and 1,1-difluoro-3-hydroxy-1-alkenes are prepared in two simple steps from 1-trifluoromethylvinylsilane: (i) its SN2′ reaction with nucleophiles to construct 2,2-difluorovinylsilanes and (ii) the subsequent substitution of electrophiles for the vinylic silyl group.
各种1,1-二氟-1-烯烃,例如单取代的1,1-二氟-1-烯烃,2-溴-1,1-二氟-1-烯烃和1,1-二氟-3-羟基-1-从1-三氟甲基乙烯基硅烷通过两个简单的步骤制备烯烃:(i)S N 2'与亲核试剂的反应以构建2,2-二氟乙烯基硅烷,以及(ii)随后用亲电试剂取代乙烯基甲硅烷基。