Efficient Synthesis of New 4-Arylideneimidazolin-5-ones Related to the GFP Chromophore by 2+3 Cyclocondensation of Arylideneimines with Imidate Ylides
作者:Janusz Kowalik、Anthony Baldridge、Laren Tolbert
DOI:10.1055/s-0029-1218796
日期:2010.7
A 2+3 condensation of a wide assortment of Schiff bases, prepared from aromatic aldehydes and primary amines, with methyl 2-(1-ethoxyethylideneamino)acetate allows convenient access to an extensive family of substituted 4-arylideneimidazolin-5-one analogues of the green fluorescent protein (GFP) chromophore. 4-arylideneimidazolin-5-one - azomethine ylide - Schiff bases - heterocycle - 2+3 cycloaddition
Four-Electron Electrocyclic Ring-Opening/Intermolecular [4+2] Cycloadditions of α-Hydroxycyclobutenones: Stereoselective Synthesis of Multiple Substituted δ-Lactams
作者:Peidong Song、Qing Li、Congcong Wang、Wenfa Wu、Xu Mao、Jiajia Wang、Xiangdong Hu
DOI:10.1002/adsc.201501152
日期:2016.4.14
four‐electron electrocyclic ring‐opening/intermolecular [4+2] cycloaddition of α‐hydroxycyclobutenones is reported. The reaction represents the first example for the intermolecular cycloaddition of the extensively studied enol‐ketene intermediate, and provides a new synthetic route to multiply substituted δ‐lactams in high stereoselectivity.
Application of Sequential Cu(I)/Pd(0)-Catalysis to Solution-Phase Parallel Synthesis of Combinatorial Libraries of Dihydroindeno[1,2-<i>c</i>]isoquinolines
作者:Sarvesh Kumar、Thomas O. Painter、Benoy K. Pal、Benjamin Neuenswander、Helena C. Malinakova
DOI:10.1021/co200027c
日期:2011.9.12
methodology is compatible with a wide-range of aliphatic linear, branched, and ester functionalized N-substituents. Unexpectedly, the formation of regioisomers featuring a 1,2,3-contiguous substitution pattern in the aromatic ring of the indene core was observed. Three distinct combinatorial libraries with a total of 111 of members were synthesized, and 80 highly substituted dihydroindenoisoquinolines structurally
A chiral catalyst prepared from N,N′-dioxide and Co(BF4)2·6H2O was applied in the asymmetric hydride transfer initiated cyclization reaction, giving optically active tetrahydroquinolines in good yields with high enantioselectivities under mild reaction conditions. Meanwhile, in light of the absolute configuration of the product, a possible working model was proposed to explain the origin of the activation
A Novel Construction of 2-Benzazepine Scaffold Based on TiCl4-Mediated Tandem Mannich ReactionâAromatic Electrophilic Substitution
作者:Liangxi Li、Zhiming Li、Quanrui Wang
DOI:10.1002/hlca.200900107
日期:2009.12
A novelconstruction of 2‐benzazepine derivatives based on TiCl4‐mediated tandemMannich reaction of electron‐rich benzyl iminium ions with alkenyl ethers and Friedel–Crafts‐type alkylation is described. The protocol is amenable to provide the tricyclic furo[3,2‐d][2]benzazepine and pyrano[3,2‐d][2]benzazepine derivatives, respectively, with 2,3‐dihydrofuran or 3,4‐dihydro‐2H‐pyran as the substrates
描述了一种基于TiCl 4介导的富电子苄基亚胺离子与链烯基醚和Friedel – Crafts型烷基化的串联曼尼希反应的新型2-苯并ze庚因衍生物的结构。该协议适用于分别为三环呋喃[3,2- d ] [2]苯并and庚因和吡喃并[3,2- d ] [2]苯并ze庚因衍生物提供2,3-二氢呋喃或3,4-二氢呋喃。 2 H-吡喃为底物。