Palladium- and Nickel-Catalyzed Decarbonylative C–S Coupling to Convert Thioesters to Thioethers
摘要:
This Letter describes the development of a catalytic decarbonylative C-S coupling reaction that transforms thioesters into thioethers. Both Pd- and Ni-based catalysts are developed and applied to the construction of diaryl, aryl alkyl, and heterocycle-containing thioethers.
Chiral (OC)Ru(salen)-catalyzed tandem sulfimidation and [2,3]sigmatropic rearrangement: asymmetric CN bond formation
作者:Masakazu Murakami、Tsutomu Katsuki
DOI:10.1016/s0040-4039(02)00603-2
日期:2002.5
manner by using (OC)Ru(salen)-catalyzed sulfimidation and the subsequent [2,3]sigmatropic rearrangement: treatment of allyl aryl sulfides with p-toluenesulfonyl azide in the presence of a catalytic amount of (OC)Ru(salen) followed by hydrolysis of the resulting N-allyl-N-arylthio toluenesulfonamides provided N-allyl toluenesulfonamides of high enantiomeric excess.
Palladium-catalyzed insertion reactions of trimethylsilyldiazomethane
作者:Kevin L Greenman、David S Carter、David L Van Vranken
DOI:10.1016/s0040-4020(01)00363-5
日期:2001.6
Palladium(II) salts catalyze the Kirmse reaction of allylsulfides with trimethylsilyldiazomethane (TMSD) to give homoallylsulfides. Similarly, TMSD can intercept ArPdX intermediates generated during Stille couplings to give benzhydryl derivatives. The yields of this process are limited by overinsertion and β-elimination. Insertion and elimination can be harnessed to generate styrenes from benzylic
Hexacarbonylmolybdenum(0)-Induced Dechalcogenization of Allylic Sulfides, Sulfones, and Selenides: Nucleophilic Substitution and Reductive Dechalcogenization
Hexacarbonylmolybdenum(0)-induced dechalcogenization of allylic sulfides I, sulfones II, and selenides III in refluxing dioxane, which led to nucleophilic substitutions with carbon nucleophiles. Attack of the relatively bulky nucleophile, 2-ethoxycarbonyl-2-sodiocyclopentanone occurred regioselectively at the less substituted end of the allyl unit after the dechalcogenization to give only one isomer
六羰基钼 (0) 诱导的烯丙基硫化物 I、砜 II 和硒化物 III 在回流的二恶烷中脱硫,导致碳亲核试剂发生亲核取代。相对庞大的亲核试剂 2-乙氧羰基-2-钠基环戊酮的攻击在脱硫后烯丙基单元的较少取代末端发生区域选择性,仅产生一种异构体。钠丙二酸二乙酯对 I 和 III 的攻击优先发生在 γ 位,而对 II 的攻击优先发生在脱磺酰化后烯丙基单元的更多取代端。在没有碳亲核试剂的情况下,在回流的二恶烷中用 Mo(CO)6 处理 I、II 和 III 导致还原性脱硫。H2O 的加入加速了还原脱硫。
Aromatic Allylsulfenylation with in Situ Generated Allylic Thiols under the Heck Conditions
of higher thermodynamic stability can be prepared in high purity under either thermal activation or palladium(0) catalysis. Although the thermodynamically less stable regioisomers of 2 are, in general, hard to be prepared in high purity, some of them (e.g., 2d and 2h′) can be obtained with an exclusive or high selectivity by the catalysis of palladium(II). The stereoisomeric pair of 2j and 2j′ can be
Catalytic and asymmetric [2,3]sigmatropic rearrangement: Co(III)-salen catalyzed S-ylide formation from allyl aryl sulfides and their rearrangement
作者:Tsutomu Fukuda、Ryo Irie、Tsutomu Katsuki
DOI:10.1016/s0040-4020(98)01065-5
日期:1999.1
Co(III)-salen complex (8-Br) provided 3-substituted 2-arylthio-4-pentenoic acid esters stereoselectively by way of enantioselective S-ylide formation and subsequent diastereoselective [2,3]sigmatropicrearrangement. For example, the reaction of cinnamyl phenyl sulfide and (−)-menthyl α-diazoacetate provided (−)-menthyl (2R,3S)-2-phenylthio-3-phenyl-4-pentenoate of 74% de preferentially.