Cu-Catalyzed Conjugate Addition of Grignard Reagents to Thiochromones: An Enantioselective Pathway for Accessing 2-Alkylthiochromanones
作者:Qingxiong Yang、Jun Wang、Shihui Luo、Ling Meng
DOI:10.1055/s-0037-1610225
日期:2018.9
The enantioselective incorporation of alkyl groups in thiochromones was realized for the first time by a Cu/(R,S)-PPF-P t Bu2-catalyzed conjugate addition of Grignardreagents to thiochromones. With this method, a series of 2-methylthiochromanones were obtained in good yields (up to 96% yield) with moderate-to-good ee values (up to 87% ee). The established method expedites the synthesis of a large
通过Cu/(R,S)-PPF-P t Bu2 催化的格氏试剂与硫色酮的共轭加成,首次实现了烷基在硫色酮中的对映选择性掺入。使用这种方法,以良好的收率(最高 96% 的收率)获得了一系列 2-甲基硫代色满酮,其 ee 值中等至良好(最高 87% ee)。已建立的方法加速了大型手性硫代色满酮库的合成,以用于进一步的合成应用和生物学研究。
Synthesis of Enones and Enals via Dehydrogenation of Saturated Ketones and Aldehydes
作者:Gao-Fei Pan、Xue-Qing Zhu、Rui-Li Guo、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1002/adsc.201801058
日期:2018.12.21
substrate scope including various linear or cyclic saturated ketones and aldehydes. The protocol is ligand‐free, and molecular oxygen is used as the sole clean oxidant in the reaction. Due to mild reaction conditions, good functional group compatibility, and versatile utilities of enones and enals, the method can be applied in the late‐stage synthesis of natural products, pharmaceuticals and fine chemicals
Synthesis of benzothiazonine by rhodium-catalyzed denitrogenative transannulation of 1-sulfonyl-1,2,3-triazole and thiochromone
作者:Saygbechi T. Jablasone、Zihang Ye、Shengguo Duan、Ze-Feng Xu、Chuan-Ying Li
DOI:10.1039/d1ob00419k
日期:——
A facile synthesis of functionalized benzothiazonine was achieved by rhodium-catalyzed denitrogenative annulation of easily available 1-sulfonyl-1,2,3-triazole and thiochromone.
通过铑催化的易得的1-磺酰基-1,2,3-三唑和噻吩醌的脱氮环化反应,成功合成了官能化苯并噻唑啉。
Development of Conjugate Addition of Lithium Dialkylcuprates to Thiochromones: Synthesis of 2-Alkylthiochroman-4-ones and Additional Synthetic Applications
Lithium dialkylcuprates undergo conjugateaddition to thiochromones to afford 2-alkylthiochroman-4-ones in good yields. This approach provide an efficient and general synthetic approach to privileged sulfur-containing structural motifs and valuable precursors for many pharmaceuticals, starting from common substrates-thiochromones. Good yields of 2-alkyl-substituted thiochroman-4-ones are attained with
Cu(I)-Catalyzed Enantioselective Alkynylation of Thiochromones
作者:Ling Meng、Ka Yan Ngai、Xiaoyong Chang、Zhenyang Lin、Jun Wang
DOI:10.1021/acs.orglett.0c00005
日期:2020.2.7
A highly efficient asymmetric synthesis of chiral thiochromanones is developed via Cu(I)/phosphoramidite catalyzed asymmetric alkynylation of thiochromones under mild reaction conditions. The catalyst system is tolerant of various thiochromone precursors and terminal alkynes. The established asymmetrictransformation provides different enatiomeric-enriched thiochromanones with more molecular complexity