首次成功开发了一种基于廉价过渡金属镍的高效催化体系,用于挑战性环状烯基砜,3-取代的苯并[ b ]噻吩1,1-二氧化物的不对称加氢。以高收率(95-99%)和优异的对映选择性(90-99%ee)获得了一系列氢化产物,手性2,3-二氢苯并[ b ]噻吩1,1-二氧化物。根据非线性效应研究,氘标记实验和DFT计算研究的结果,为这种镍催化的不对称氢化提供了合理的催化机理,表明该氢化产物中两个加成的氢原子可能来自H 2。 通过插入Ni–H和随后的氢解反应。
[EN] PIKFYVE KINASE INHIBITORS<br/>[FR] INHIBITEURS DE KINASE PIKFYVE
申请人:ACURASTEM INCORPORATED
公开号:WO2021163727A1
公开(公告)日:2021-08-19
The present invention relates to compounds useful as inhibitors of phosphatidylinositol-3-phosphate 5-kinase (PIKfyve) as well as their use for treating diseases and disorders associated with PIKfyve.
Enantioselective Hydroarylation or Hydroalkenylation of Benzo[<i>b</i>]thiophene 1,1-Dioxides with Organoboranes
作者:Fangdong Hu、Jie Jia、Ximing Li、Ying Xia
DOI:10.1021/acs.orglett.0c04114
日期:2021.2.5
protocol for the asymmetric hydroarylation and hydroalkenylation of benzo[b]thiophene 1,1-dioxides with organoboranes has been developed. The combination of a rhodium(I) precatalyst and a chiral diene ligand constitutes the catalytic system, which enables the facile synthesis of 2,3-dihydrobenzo[b]thiophene 1,1-dioxides in good yields with high enantioselectivities. The merging of this asymmetric hydroarylation
已开发出一种有效的方案,用于有机硼烷对苯并[ b ]噻吩1,1-二氧化物的不对称加氢芳基化和加氢烯基化反应。铑(I)预催化剂和手性二烯配体的组合构成了催化体系,该体系能够以高收率和高对映选择性轻松合成2,3-二氢苯并[ b ]噻吩1,1-二氧化物。该不对称氢芳基化与下游烷基化的合并以非对映异构的方式提供了包含两个具有高对映选择性的连续的季立体中心的2,3-二氢苯并[ b ]噻吩1,1-二氧化物。
The Selective Cross-Coupling of Secondary Alkyl Zinc Reagents to Five-Membered-Ring Heterocycles Using Pd-PEPPSI-IHept<sup>Cl</sup>
作者:Bruce Atwater、Nalin Chandrasoma、David Mitchell、Michael J. Rodriguez、Matthew Pompeo、Robert D. J. Froese、Michael G. Organ
DOI:10.1002/anie.201503941
日期:2015.8.10
leads to β‐hydride elimination. Whereas catalysts have been reported that provide decent selectivity for the expected (non‐rearranged) cross‐coupled product with aryl or heteroaryl oxidative‐addition partners, none have shown reliable selectivity with five‐membered‐ring heterocycles. In this report, a new, rationally designed catalyst, Pd‐PEPPSI‐IHeptCl, is demonstrated to be effective in selective
A novel one-step synthesis of 3-substituted benzo[b]thiophene derivatives was achieved by dilithiation of (methylthio)benzene followed by reaction with varous aliphatic and aromatic carboxylic acid chlorides.
Abstract The radical reaction of benzenethiol with alkynes 1a-o carried out at 154 °C affords a mixture of thiol/alkyne adduct 3 and benzothiophene 5, deriving from vinyl radical intermediates 2 through hydrogen abstraction and 5-(π-endo)orthocyclization onto the adjacent thiophenyl ring, respectively. This latter reaction occurs through the reversible formation of cyclohexadienyl radical intermediates