Synthesis of Thioalkynes by Desilylative Sonogashira Cross‐Coupling of Aryl Iodides and 1‐Methylthio‐2‐(trimethylsilyl)ethyne
作者:Yang Cao、Yang Huang、Paul R. Blakemore
DOI:10.1002/ejoc.202200498
日期:2022.9.13
An efficient and operationally straightforward synthesis of 1-methylthio-2-arylethyne derivatives is described based on a desilylativeSonogashira cross-coupling between aryliodides and a silylated surrogate for methylthioacetylene (Me3SiCCSMe). Extension of the process to a selection of other thioether types is also documented.
Direct methylthiolation of <i>C</i>-, <i>S</i>-, and <i>P</i>-nucleophiles with sodium <i>S</i>-methyl thiosulfate
作者:Fanmin Liu
DOI:10.1039/d2ob02056d
日期:——
A practical and efficient methylthiolation that employed the typical Bunte saltsodium S-methyl sulfothioate as the sulfur source was described. This reagent could react with a variety of compounds such as alkynes, 1,3-diketones, thiols, selenol and H-phosphine oxides, affording methylthiolated products in moderate to excellent yields. The advantages such as easy preparation, air- and moisture-stability
Enantiocontrolled Connective Synthesis of Allenes by Carbenoid Eliminative Cross-Coupling between α-(Methylthio)vinylcuprate Species and α-(Carbamoyloxy)alkylboronates
作者:Paul R. Blakemore、Yang Cao
DOI:10.1055/a-2072-2882
日期:2023.11
A convenient enantiocontrolled synthesis of allenes (R1R2C=C=CHR3, R1 = aryl/alkyl, R2, R3 = alkyl) is described based on carbenoid eliminative cross-coupling (CEXC) between geometrically pure higher-order α-(methylthio)vinylcuprates, generated in situ by carbocupration of thioalkynes (then activation by addition of n-BuLi), and enantioenriched α-(carbamoyloxy)alkylboronates (15 examples, 30–78% yield
丙二烯(R 1 R 2 C=C=CHR 3,R 1 = 芳基/烷基,R 2,R 3 = 烷基)的简便对映控制合成基于几何纯高分子之间的卡宾消除交叉偶联 (CEX C ) 进行了描述-order α-(甲硫基)乙烯基铜酸盐,通过硫代炔烃的碳化铜化原位生成(然后通过添加n -BuLi活化)和富含对映体的 α-(氨基甲酰氧基)烷基硼酸盐(15 个实例,30-78% 产率,15-95% ee ). 该 CEX C过程的立体化学保真度依赖于底物,这种现象暂时归因于推定的有机铜介导的丙二烯外消旋化途径。
Ru- and Co-Catalyzed Intermolecular Carbonyl–Alkyne Metathesis Reactions of 1<i>H</i>-Indene-1,2,3-triones with Internal Alkynes
作者:Yuhang Wang、Peng Ma、Jianhui Wang
DOI:10.1021/acs.orglett.4c00751
日期:2024.4.19
The catalyst-dependent intermolecular carbonyl–alkyne metathesis (CAM) reaction of 1H-indene-1,2,3-triones with internal alkynes was realized using Ru and Co catalysts. 2-(2-Oxo-1,2-diphenylethylidene)-1H-indene-1,3(2H)-dione derivatives were obtained using a Ru catalyst, whereas S-alkyl 2-(1,3-dioxo-1,3-dihydro-2H-inden-2-ylidene)-2-phenylethanethioates were prepared using a Co catalyst. These transformations
使用Ru和Co催化剂实现了1 H-茚-1,2,3-三酮与内部炔烃的依赖于催化剂的分子间羰基-炔复分解(CAM)反应。使用Ru催化剂得到2-(2-Oxo-1,2-二苯基亚乙基)-1 H-茚-1,3(2 H )-二酮衍生物,而S-烷基2-(1,3-二氧代-1使用Co催化剂制备3-二氢-2H-茚-2-亚基)-2-苯基乙硫酸酯。这些转化导致合成了具有广泛底物范围、优异的区域控制和克级适应性的 α,β-不饱和羰基化合物。这种使用 Co 或 Ru 催化剂的催化策略很少被描述用于其他成熟的 CAM 催化剂。
Brouwer, A. C.; Bos, H. J. T., Recueil des Travaux Chimiques des Pays-Bas, 1984, vol. 103, # 5, p. 152 - 164