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
A new class of spiro pyrrolidines, dispiro[oxindole-cyclohexanone]pyrrolidines,(1) dispiro[oxindole-tetrahydronaphthalen-1-one]pyrrolidines,(2) dispiro[oxindole-arylidene-cyclohexanone]pyrrolidines,(3) dispiro[oxindole-hexabydro-indazole]pyrrolidines,(3) and spiro[butenolide]pyrrolidines,(4) have been screened for their antibacterial and antifungal activity against ten human pathogenic bacteria and four dermatophytic fungi. They were found to have antimicrobial and antifungal activity compounds against various pathogens except Bacillus subtilis. The spiro pyrrolidinines were synthesized by the regioselective 1,3-dipolar cycloaddition reaction of azomethine ylides generated either from isatin and sarcosine or from aziridine. The azomethine ylide so generated reacted with various dipolarophiles such as 2-arylidene-cyclohexanones, 2-arylidene-tetrahydronapthalen-1-ones, 2,6-bis(arylmethylidene)cyclohexanones and 3-arylidene-5-phenyl- butenolides. (C) 2002 Elsevier Science Ltd. All rights reserved.