A Simplified Protocol for the Stereospecific Nickel-Catalyzed C–S Vinylation Using NiX2 Salts and Alkyl Phosphites
作者:Austin D. Marchese、Bijan Mirabi、Egor M. Larin、Mark Lautens
DOI:10.1055/s-0039-1690717
日期:2020.1
A Ni-catalyzed C–S cross-coupling using only NiI2 (0.5–2.5 mol%) and P(OiPr)3 (2.0–10.0 mol%) is reported. Using an air-stable Ni(II) precatalyst, and a cheap and commercially available ligand, a scalable and robust method was developed to cross-couple various thiophenols and styryl bromides, including some sterically encumbered thiols, an α-bromocinnamaldehyde as well as a thiolation-cyclization.
据报道,仅使用NiI 2(0.5–2.5 mol%)和P(O i Pr)3(2.0–10.0 mol%)的Ni催化的C–S交叉偶联。使用空气稳定的Ni(II)预催化剂和便宜的市售配体,开发了一种可扩展且稳健的方法来交叉偶联各种硫酚和苯乙烯基溴化物,包括一些空间受限的硫醇,α-溴肉桂醛和硫醇化环化。
<i>N</i>-Heterocyclic Carbene Catalyzed Sulfenylation of α,β-Unsaturated Aldehydes
作者:Yu-Ting Dong、Quan Jin、Ling Zhou、Jie Chen
DOI:10.1021/acs.orglett.6b02939
日期:2016.11.4
An efficient N-heterocyclic carbene (NHC) catalyzed sulfenylation reaction of α,β-unsaturatedaldehydes with N-(arylthio)phthalimide has been developed. A wide variety of α-thioenals can be obtained with good to excellent yields and excellent Z-configuration.
N-Heterocyclic carbene-catalyzed formal cross-coupling reaction of α-haloenals with thiols: organocatalytic construction of sp2 carbon–sulfur bonds
作者:Lin He、Hao Guo、Yuan-Zhen Li、Guang-Fen Du、Bin Dai
DOI:10.1039/c4cc00154k
日期:——
A novel N-heterocyclic carbene (NHC)-catalyzed formal cross-coupling reaction between α-haloenals and thiols was developed. In the presence of 5 mol% NHC precursors and 1.6 equiv. potassium carbonate, various thiols coupled with α-haloenals to produce α-thioenals in 53% to 91% yield and excellent Z-selectivity.
Synthesis of ketene (S, Te)acetals and their transformation into Z-α-phenylthio-α,β-unsaturated aldehydes
作者:Claudio C Silveira、Gelson Perin、Antonio L Braga、Miguel J Dabdoub、Raquel G Jacob
DOI:10.1016/s0040-4020(99)00389-0
日期:1999.6
phosphonates with aryl (or butyl) tellurenyl halides and aldehydes under basic conditions provides moderate to good yields of ketene thio (telluro) acetals, with vinylicsulfides being byproducts of this transformation. Tellurium-lithium exchange by reaction with n-BuLi yielded vinyl organolithium species, which were captured with several electrophiles. In the case of DMF, Z-α-phenylthio-α,β-unsaturated
作者:Evgeniy V. Kondrashov、Alexey R. Romanov、Igor A. Ushakov、Alexander Yu. Rulev
DOI:10.1080/17415993.2016.1215448
日期:2017.1.2
derivatives has been developed. The one-pot treatment of the haloenoates, haloenones or haloenals with thiols in the presence of organic base leads either to vicinal dithiosubstituted carbonyl-bearing compound or captodative systems with good to excellent yield. The major reaction direction strongly depends on the type of base used. GRAPHICAL ABSTRACT