Deconjugative alkylation/Heck reaction as a simple platform for dihydronaphthalene synthesis
作者:Primali V. Navaratne、Alexander J. Grenning
DOI:10.1039/c6ob02250b
日期:——
A simple platform for carbocycle synthesis by Knoevenagel adduct deconjugative alkylation/Heckreaction is described. Deconjugative alkylation of Knoevenagels adducts is two-fold synthetically enabling because C–C bond formation is (1) operationally simple due to the ease of Knoevenagel adduct carbanion generation and (2) results in alkene migration, which poises the substrate for cyclization. Furthermore
Preparation of 5-Cyano-4,6-dimethyl-2<i>H</i>-pyran-2-one and 3-Cyano-5-methoxy-4-methyl-5<i>H</i>-furan-2-one via a One-Pot, Domino-Knoevenagel Process
作者:Prativa B. S. Dawadi、Johan Lugtenburg
DOI:10.1080/00397910903277904
日期:2010.8.5
5-Cyano-4,6-dimethyl-2H-pyran-2-one (1) has been prepared via a simple one-pot domino-Knoevenagel reaction starting from ethyl acetoacetate (2) and cyanoacetone (3). Similarly, a new racemic 3-cyano-5-methoxy-4-methyl-5H-furan-2-one (7) has been prepared from 1,1-dimethoxyacetone (6) and cyanoacetic acid (4). The new alkylidene derivatives (Z/E)-ethyl-4-cyano-3-methylbut-3-enoate (5), (Z/E)-ethyl
Unexpected metal-free synthesis of trifluoromethyl arenes <i>via</i> tandem coupling of dicyanoalkenes and conjugated fluorinated sulfinyl imines
作者:Alvaro Sanz-Vidal、Daniel Gaviña、Lia Sotorríos、Enrique Gómez-Bengoa、Fernando López Ortiz、María Sánchez-Roselló、Carlos del Pozo
DOI:10.1039/d1cc03161a
日期:——
A novel strategy for the synthesis of policyclic trifluoromethyl arenes has been devised. It involves a DBU-promoted tandem cycloaromatization reaction of dicyanoalkenes and fluorinated conjugated sulfinyl imines. This unprecedented transformation is a metal-free and air-tolerant process that takes place from readily available starting materials under mild reaction conditions.
Promoting Thermodynamically Unfavorable [3,3] Rearrangements by Chemoselective Reduction
作者:Peter Vertesaljai、Roberto Serrano、Michael D. Mannchen、Matthew Williams、Evgeniya Semenova、Alexander J. Grenning
DOI:10.1021/acs.orglett.9b02057
日期:2019.7.19
Herein described is a strategy for promoting thermodynamically unfavorable [3,3] Cope rearrangements. 3,3-Dicyano-1,5-dienes that are resistant to the thermal rearrangement can be promoted under reductive conditions. The reduced Cope products are versatile, bifunctional building blocks.
Domino Reactions with Dicyanoalkenes and Fluorinated Conjugated Sulfinyl Imines. A Convenient Strategy for the Generation of Structural Diversity
作者:Daniel Gaviña、Marcos Escolano、Lía Sotorríos、Enrique Gómez‐Bengoa、Fernando López‐Ortiz、María Sánchez‐Roselló、Carlos del Pozo
DOI:10.1002/adsc.202301123
日期:2024.2.20
compounds are obtained by chemical synthesis. In this context, the use of fluorinated building blocks is one of the most prevalent strategies to introduce fluorine atoms into organic molecules.10 This approach requires small fluorinated molecules, stable and easily available in large scale. Among them, fluorinated imines are one of the most popular building blocks for the synthesis of fluorinated nitrogen-containing