Journal of the American Chemical Society 由美国化学会出版。1155 Sixteenth Street NW, Washington, DC 20036 通过抗体催化跨越极端机械障碍:顺式烯烃消除 Benjamin F. Cravatt、Jon A. Ashley、Kim D. Janda、Dale L. Boger 和 Richard A. Lerner J.是。化学 Soc., 1994, 116 (13), 6013-6014 • DOI:10.1021/ja00092a080 2009 年 1 月 15 日从 http://pubs.acs.org 下载
New synthetic applications of organotin compounds: synthesis of stereodefined 2-iodo-2-alkenones, 2-substituted (E)-2-alkenones and 2-methyl-2-cycloalkenones
作者:Fabio Bellina、Adriano Carpita、Donatella Ciucci、Massimo De Santis、Renzo Rossi
DOI:10.1016/s0040-4020(01)81297-7
日期:1993.5
product, (E)-13f with the compound derivedfrom methyl transfer, (E)-13e. The couplings involving (Z)-8a, (Z)-8b, (Z)-8c and (Z)-8d proceeded with clean retention of stereochemistry, but the Pd-catalyzed reaction between (E)-8c and SnMe4 afforded a stereoisomeric mixture of 13e. On the contrary, the coupling between (E)/(Z)-8b and SnMe4 produced stereoisomerically pure (E)-13c. Two 2-iodo-2-cycloalkenones
Tin(II) chloride, which is insensitive to water and air, mediated the coupling reaction between alkynes and aldehydes as a Lewis acid in nitromethane to produce (E)-α,β-unsaturated ketones by a skeletal transformation in which one alkynic carbon atom changed into an oxo carbon atom accompanied by the cleavage of a C=O bond in the starting aldehydes. This coupling reaction was promoted by a catalytic
New Photochromic α-Methylchalcones Are Highly Photostable, Even under Singlet Oxygen Conditions: Breaking the α-Methyl Michael-System Reactivity by Reversible Peroxybiradical Formation
regioselectivity. Even after long irradiations times in the presence of the singlet oxygen sensitizer tetraphenylporphyrin (TPP) and oxygen, however, no oxygenation products were detected. Under these conditions, all substrates were converted into 9:1 E/Z-mixtures despite the use of low-energy light that does not allow direct or sensitized excitation of the substrates 7. Additionally, chalcone 7a reduced the singlet
Nickel‐Catalyzed Chemodivergent Coupling of Alcohols: Efficient Routes to Access α,α‐Disubstituted Ketones and α‐Substituted Chalcones
作者:Sadhna Bansal、Benudhar Punji
DOI:10.1002/chem.202304082
日期:2024.3.12
The chemodivergent nickel-catalyzed approach provides α,α-disubstituted ketones from aryl-substituted secondary alcohols and benzyl alcohols via the borrowinghydrogen (BH) strategy in the presence of KOtBu, whereas exclusively α-substituted chalcones were accomplished in the presence of mild base K2CO3 through an acceptorless dehydrogenative coupling (ADC) strategy.
化学发散镍催化方法在 KO t Bu 存在下通过借氢 (BH) 策略从芳基取代的仲醇和苯甲醇提供α , α-二取代酮,而仅α-取代查耳酮是在 KO t Bu 存在下完成的。通过无受体脱氢偶联 (ADC) 策略实现弱碱 K 2 CO 3 。