A novel gold-catalyzed ethynylation of aromatic rings with electron-deficient alkynes via gold catalyzed C-H activation of both C(sp)-H and C(sp(2))-H bonds has been developed. This transformation provides aromatic propiolates difficult to prepare by other methods, highlighting the synthetic potential of gold chemistry.
Electrochemically Mediated Oxidation of Sensitive Propargylic Benzylic Alcohols
作者:Chad E. Hatch、Maxwell I. Martin、Philip H. Gilmartin、Lu Xiong、Danielle J. Beam、Glenn P. A. Yap、Matthew J. Von Bargen、Joel Rosenthal、William J. Chain
DOI:10.1021/acs.orglett.1c03860
日期:2022.2.25
The electrochemicaloxidation of sensitive propargylic benzylic alcohols having varying substituents is reported. We describe the preparation and characterization of N-hydroxytetrafluorophthalimide (TFNHPI) and pseudo-high-throughput development of a green electrochemicaloxidation protocol for sensitive propargylic benzylic alcohols that employs TFNHPI as a stable electrochemical mediator. The electrochemical
Application of a CC Bond-Forming Conjugate Addition Reaction in Asymmetric Dearomatization of β-Naphthols
作者:Dongxu Yang、Linqing Wang、Ming Kai、Dan Li、Xiaojun Yao、Rui Wang
DOI:10.1002/anie.201503056
日期:2015.8.10
conjugate reaction was successfully applied to the enantioselectivedearomatization of β‐naphthols. A C(sp2)C(sp3) bond is formed by using propargylic ketones as reactive partners. Good to excellent Z/E ratios and ee values were obtained by employing an in situgeneratedmagnesiumcatalyst. Further transformations of the Z‐configured CC double bond in the products were achieved under mild reaction conditions
AC C键形成共轭反应成功地应用于β萘酚的对映选择性脱芳构化。AC(sp2)C(sp3)键是通过使用炔丙基酮作为反应伙伴而形成的。 通过使用原位生成的镁催化剂获得了良好的Z / E 比和ee值。在温和的反应条件下,产物中Z构型的CC双键进一步转化。此外,通过计算化学探索了这种镁催化的脱芳香化反应的立体控制元素。
TfOH-promoted synthesis of indoles and benzofurans involving cyclative transposition of vinyl ketone
作者:Mou Mandal、Rengarajan Balamurugan
DOI:10.1039/d2cc03730k
日期:——
derived from o-alkynylanilines involving a cyclization, retro-aza-Michael reaction and amine trapping cascade is reported here. This atom-economical transformation has been extended to synthesize benzofuran derivatives using analogous vinylogous esters derived from o-alkynylphenols. The excellent stereochemical outcome of the double bond geometry in the products makes it attractive.
using their vinylogous amides under goldcatalysis to access a wide array of benzo[b]azepines in an atom economical way with excellent functional group compatibility. Deuterium scrambling experiments and DFT studies favor a mechanism involving stabilizing conformational change of the initially formed seven-membered vinyl gold intermediate through a key cyclopropyl gold carbene intermediate and its subsequent
已经提出了一种直接闭环策略,该策略涉及用于合成苯并 [ b ] 氮卓类化合物的o -炔基苯胺衍生物的不太容易进行 7-内切-挖掘碳环化。由于氮的高亲核性,在 o -炔基苯胺衍生物中的微不足道的 5-内切环化已被克服,通过在金催化下使用它们的插烯酰胺来获得广泛的苯并[ b ]]azepines 以原子经济的方式具有出色的官能团相容性。氘加扰实验和 DFT 研究支持一种机制,该机制涉及通过关键的环丙基金卡宾中间体稳定最初形成的七元乙烯基金中间体的构象变化及其随后由抗衡阴离子介导的原脱氧反应。