¹³C NMR of coumarins I: 3‐(1,1‐Dimethylallyl) derivatives

Abstract

The 13C NMR data of nine 3‐(1,1‐dimethylallyl)coumarins are reported and compared with those of the corresponding C‐3 unsubstituted compounds. A spectro‐scopic criterion for distinguishing C‐3 alkylated dihydrofurano‐ from dihydro‐pyrano‐coumarins is proposed.

Anti-Neuroinflammatory Components from Clausena lenis Drake

“…Thirty-two known compounds were identified as 4-methoxy- N -methyl-2-quinolone ( 6 ) [ 29 ], (–)-( S )-edulinine ( 7 ) [ 30 ], dictamine ( 8 ) [ 31 ], pteleine ( 9 ) [ 32 ], cinnamamide ( 10 ) [ 33 ], N -methylcinnamamide ( 11 ) [ 34 ], ( Z )- N -methyl-3-phenylacrylamide ( 12 ) [ 35 ], N -2-phenylethylcinnamamide ( 13 ) [ 36 ], lansiumamide A ( 14 ) [ 37 ], lansiumamide B ( 15 ) [ 37 ], (2 E )-3-phenyl- N -[( E )-2-phenylvinyl]acrylamide ( 16 ) [ 38 ], lansamide I ( 17 ) [ 39 ], 2-benzothiazolol ( 18 ) [ 40 ], indole ( 19 ) [ 41 ], N , N′ -bis[2(1 H -indol-3-yl)ethyl]urea ( 20 ) [ 42 ], demethylsuberosin ( 21 ) [ 43 ], swietenocoumarin I ( 22 ) [ 44 ], xanthyletin ( 23 ) [ 45 ], 3’-hydroxyxanthyletn ( 24 ) [ 46 ], (–)-3-( R )-decursinol ( 25 ) [ 47 ], dimethyl allyl xanthyletin ( 26 ) [ 48 ], 3-(1,1-dimethylallyl)decursinol ( 27 ) [ 49 , 50 ], imperatorin ( 28 ) [ 51 ], phellopterin ( 29 ) [ 52 ], (–)-heraclenol ( 30 ) [ 53 , 54 ], (+)-isoangenomalin ( 31 ) [ 55 ], nodakenetin ( 32 ) [ 56 ], chalepin ( 33 ) [ 57 ], 6-methoxymicrominutinin ( 34 ) [ 58 ], marmesinin ( 35 ) [ 59 ], marmesin glycoside ( 36 ) [ 60 ], (2 R )-2′-hydroxy...…”