alpha-Arylidene-gamma-phenyl-Delta(beta,gamma)-butenolides were converted to the respective gamma-butyrolactones in methyl alcohol with sodium borohydride in presence of triethylamine in a single pot.
A General Cyclocarbonylation of Aryl Bromides and Triflates with Acetylenes: Palladium-Catalyzed Synthesis of 3-Alkylidenefuran-2-ones
作者:Xiao-Feng Wu、Basker Sundararaju、Pazhamalai Anbarasan、Helfried Neumann、Pierre H. Dixneuf、Matthias Beller
DOI:10.1002/chem.201101083
日期:2011.7.11
Making use of CO: An improved efficient synthesis of 5‐aryl‐3‐alkylidenefuran‐2‐ones has been developed (see scheme). Starting from readily available (hetero)arylbromides or aryltriflates and alkynes, furanones were produced in good yields through a double carbonylation process. To illustrate the generality of the method more than 25 furanone derivatives were synthesized, including the permethylated
Palladium-Catalyzed Carbonylative Coupling of Aryl Iodides and Benzyl Acetylenes to 3-Alkylidenefuran-2-ones under Mild Conditions and Its Density Functional Theory Modeling
A general and efficient method for the palladium‐catalyzed carbonylativecoupling of aryliodides to benzylacetylenes has been developed. Various furanones have been prepared in excellent yields from their corresponding benzylacetylenes at room temperature under a CO atmosphere. For aliphatic alkynes, their corresponding alkynones were obtained in good yields. Detailed DFT calculations have also
Synthesis of spiro pyrrolidines via formal [3+2] cycloaddition of unusual enones and cis-3-benzoyl-1-cyclohexyl-2-phenylaziridine
作者:A Amal Raj、R Raghunathan
DOI:10.1016/s0040-4020(03)00346-6
日期:2003.4
The synthesis of a new class of spiro[tetrahydronaphthalen-one/butenolide]pyrrolidines has been accomplished by the 1,3-dipolar cycloaddition of azomethine ylide generated by thermal ring opening of cis-3-benzoyl-1-cyclohexyl-2-phenylaziridine with (E)-2-arylidene-1,2,3,4-tetrahydronaphthalen-1-ones and (E)-3-arylidene-5-phenyl-Δ4,5-butenolides. The structures of the products were confirmed by spectroscopic
An organocatalytic cis-selective approach to bicyclic δ-lactones
作者:Dorota Kowalczyk、Łukasz Albrecht
DOI:10.1039/c7ob01570d
日期:——
A new, cis-selective, approach for the synthesis of bicyclic δ-lactones bearing a fused cyclohex-2-en-1-one moiety is described. The strategy utilizes a cascade reactivity of cyclic 1,3-diketones and 3-arylidenefuran-2(3H)-ones with the butenolide-ring-opening reaction enabling the construction of the δ-lactone framework. It benefits from broad scope, high enantioselectivity and excellent cis-diastereoselectivity
α,β-Unsaturated butenolides in an organocatalytic doubly annulative cascade for the preparation of 3,4-dihydrocoumarins
作者:Dorota Kowalczyk-Dworak、Łukasz Albrecht
DOI:10.1039/c9ob00068b
日期:——
A new, organocatalytic doubly annulative cascade utilizing α,β-unsaturated butenolides and imines (derived from salicyl aldehydes and α-amino-γ-lactones) as starting materials is described. The developed strategy is based on two annulative processes: (1) initial [3 + 2]-dipolar cycloaddition allowing for the construction of a pyrrolidine ring; and (2) the butenolide-ring-opening reaction leading to