已开发出一种高效的钌 (II) 催化串联 C-C/C-N 键与芳基酰胺和 7-氮杂苯并降冰片二烯形成合成顺式稠合二氢苯并[ c ]菲啶酮。酰胺基团起导向基团和离去基团的作用,并提供了一种容易获得药学上有用的苯并[ c ]菲啶生物碱如尼替丁和法加罗宁类似物的途径。本方法与关于氮杂双环烯烃和芳族酰胺的各种官能团相容。氘标记研究提出并支持了涉及定向基团辅助 C-H 活化的反应机制。
Palladium/Lewis Acid Cocatalyzed Reductive Asymmetric Ring-Opening Reaction of Azabenzonorbornadienes with Tertiary Amines as the Hydrogen Source
作者:Dapeng Zhang、Ruhima Khan、Fan Yang、Xuexin Zhang、Guoli Shen、Yang Gao、Ruifeng Fan、Weiqing Sun、Baomin Fan
DOI:10.1002/ejoc.201800503
日期:2018.7.13
Palladium and silver cocatalyzed the asymmetric transfer hydrogenation of azabenzonorbornadienes with tertiary amines to give the corresponding ring‐opening products in high yields with good to excellent enantioselectivities. (R)‐2,2′‐Bis(diphenylphosphino)‐1,1′‐binaphthyl [(R)‐BINAP] and para‐methoxybenzoic acid were used as the chiral ligand and additive, respectively, in the reported protocol.
Asymmetric Transfer Hydrogenation of Heterobicyclic Alkenes with Water as Hydrogen Source
作者:Guoli Shen、Jingchao Chen、Dandan Xu、Xia Zhang、Yongyun Zhou、Baomin Fan
DOI:10.1021/acs.orglett.9b00059
日期:2019.3.1
The asymmetric transfer hydrogenation of heterobicyclic alkenes was accomplished by using water as the sole hydrogensource. The transformation was co-catalyzed by Pd(OAc)2/Zn(OTf)2 dual catalyst with metallic zinc as reducing agent. Various azabenzonorbornadienes and oxabenzonorbornadienes were transformed to the corresponding chiral 1,2-dihydronaphthalenes by the asymmetric reductive ring-opening
Palladium/Lewis Acid Co-catalyzed Divergent Asymmetric Ring-Opening Reactions of Azabenzonorbornadienes with Alcohols
作者:Fan Yang、Jingchao Chen、Jianbin Xu、Fujie Ma、Yongyun Zhou、Madhuri Vikas Shinde、Baomin Fan
DOI:10.1021/acs.orglett.6b02300
日期:2016.10.7
catalysts and Lewis acids, both the additional and reductive asymmetricring-openingreactions of azabenzonorbornadienes with alcohols were accomplished with good chemoselectivity, regioselectivity, and enantioselectivity. It was proven that the reductive ring-opening products were generated through a transfer-hydrogenation process with alcohols as hydrogen source.
A Readily Accessible Class of Chiral Cp Ligands and their Application in Ru
<sup>II</sup>
‐Catalyzed Enantioselective Syntheses of Dihydrobenzoindoles
作者:Shou‐Guo Wang、Sung Hwan Park、Nicolai Cramer
DOI:10.1002/anie.201802244
日期:2018.5.4
Chiral cyclopentadienyl (Cpx) ligands have a large application potential in enantioselective transition‐metal catalysis. However, the development of concise and practical routes to such ligands remains in its infancy. We present a convenient and efficient two‐step synthesis of a novel class of chiral Cpx ligands with tunable steric properties that can be readily used for complexation, giving CpxRhI
手性环戊二烯(Cp x)配体在对映选择性过渡金属催化中具有巨大的应用潜力。但是,开发这种配体的简洁实用的方法仍处于起步阶段。我们提出了一种方便有效的两步合成具有可调空间特性的新型手性Cp x配体的方法,可以很容易地用于络合,得到Cp x Rh I,Cp x Ir I和Cp x Ru II复合体。后者在用炔烃对氮杂苯并降冰片二烯进行对映选择性环化中得到了证明,后者可提供高达98:2 er的二氢苯并吲哚,显着优于现有的由双萘基衍生的Cp x配体。
Nickel-Catalyzed Regio- and Stereoselective Reductive Coupling of Oxa- and Azabicyclic Alkenes with Enones and Electron-Rich Alkynes
作者:Subramaniyan Mannathan、Chien-Hong Cheng
DOI:10.1002/adsc.201300910
日期:2014.7.7
2‐alkylnaphthalenes in good to excellent yields. Under similar reaction conditions, 7‐azabenzonorbornadiene derivatives provided cis‐2‐alkyl‐1,2‐dihydronaphthalene derivatives in high yields. On the other hand, the nickel(II) iodide, tris(4‐fluorophenyl)phoshine [P(4‐FC6H4)3] and zinc catalyst system successfully catalyzed the reductive coupling reaction of electron‐rich alkynes, with 7‐aza‐ and 7‐oxabenzonorbornadienes
描述了镍催化的氧杂和氮杂双环烯烃与活性烯烃和富电子炔烃的区域和立体选择性还原偶联。因此,在碘化镍(II)(NiI 2),锌(Zn)和水存在下,7-氧杂苯并降冰片二烯与各种乙烯基酮如乙基,甲基,丙基和α-甲基取代的乙烯基酮进行还原偶联在乙腈中于50°C的催化剂体系中反应14 h,以良好或优异的收率得到2-烷基萘。在相似的反应条件下,7-氮杂苯并降冰片二烯衍生物以高收率提供顺式-2-烷基-1,2-二氢萘衍生物。另一方面,碘化镍(II)三(4-氟苯基)膦[P(4-FC 6 H 4)3]和锌催化剂体系成功地催化了富电子炔烃与7-氮杂和7-氧杂苯并降冰片二烯的还原偶联反应,从而以良好的产率获得了顺式-2-烯基-1,2-二氢萘衍生物。在反应中,使用了温和的还原剂(锌)和简单的氢源(水)。