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2- -2//-l-benzopyran-2-one

Hydroxy-4-methyl-6-(l-oxopropyl)-2//-l-benzopyran-2-one, 1998 7-Hydroxy-4-methyl-6-(l-oxopropyl)-2i7-l-benzopyran-2-one, 1999 7-Hydroxy-4-methyl-8-(l-oxopropyl)-2/7-l-benzopyran-2-one, 1999... [Pg.2648]

Di hydroxy-6-methoxy-2 H-l -benzopyran-2-one Fraxetin CioHsOs 674-84-6 208.168 pi (dil al) 231 vs EtOH... [Pg.304]

Di-Me ether [150358-93-3]. 3-Amino-6,7-dimethoxy-2 A-l-benzopyran-2-one. 3-Amino-6,7-dimethoxycoumarin C H N04 M 221.212... [Pg.12]

Bolegrevilol, in T-20106 6-[(3,4-Dihydro-6-methoxy-2,8-dimethyl-2/7-l-benzopyran-2-yl)methyl]-l,2,3,3a,7,7a-hexahydro-5-(2-hydroxy-2-methylpropyl)-3fl,7a-dimethyl-4//-inden-4-one, D-30118 6-[(3,4-Dihydro-6-methoxy-2,8-dimethyl-2//-1 -benzopyran-2-yl)methyl]-l,2,3,3a,7,7fl-hexahydro-5-(2-hydroxy-2-methylpropyl)-3a,7fl-dimethyl-4/7-inden-4-one 2 -Epimer, in D-30118... [Pg.589]

Visnagin (4-methoxy-7-methyI-5tf-furo[3,2-g][l]benzopyran-5-one) 142-145 . Crystd from water. [Pg.386]

Xanthotoxin (Methoxalen, 9-methoxyfuro[3,2-g][l]benzopyran-7-one) [298-81-7] M 216.2, m 146-148 , 148 , 148-149 . Purified by recrystn from CgH6-pet ether (b 60-80°) as silky needles, Et0H-Et20 as rhombic prisms or hot H2O as needles. It is soluble in aqueous alkali due to ring opening of a lactone but recyclises upon acidification. It has UV EtOH at 219, 249 and 300nm (log e... [Pg.577]

Ayyangar NR, Srinivasan KV, Daniel T (1991) Polycyclic compounds Part VII. Synthesis, laser characteristics and dyeing behaviour of 7-diethylamino-2H-l-benzopyran-2-ones. Dyes Pigm 16 197-204... [Pg.183]

The ancient Egyptians used the plantAmmi majus, which contains methoxsalen (sometimes called 8-methoxypsoralen, based on a now obsolete method of naming fused heterocycles indexed in Chemical Abstracts under furo[3,2-g][l]benzopyran-7-one, 9-methoxy-, 249), in combination with sunbathing to... [Pg.91]

Deoxy-a-I mannopyranosyl)- p-D-gluco-pyranosyl]-oxy)-5,7-dihydroxy-2- (4-hydroxy-3-methoxyphenyl)-4/7-l-benzopyran-4-one Narcissin... [Pg.13]

Trioxsalen (2,5,9-trimethyl-7H-furo[3,2-g][l]benzopyran-7-one) [3902-71-4] M 228.3, m 233-235", 234,5-235". Purified by recrystn from CHCI3. If too impure it is fractionally crystd from CHCl3-pet ether (b 30-60°) using Norit and finally crystd from CHCI3 alone to give colourless prisms, m... [Pg.352]

In complex heterocyclic compounds, the terms coumarano, couma-rono, coumarino are therefore rejected, although they allow a shortening of the occasionally somewhat cumbersome and forbidding Chemical Abstracts nomenclature thus, coumestrol (4) will not be called the dihydroxy derivative of coumarono[3,2-c]coumarin,7 but 3,9-dihydroxy-6 -benzofuro[3,2-c][ l]benzopyran-6-one. [Pg.339]

Coumarinyloxy-2-butanones, obtained from suitable Bz-hydroxy-coumarins, can be dehydrated (with H2S04) to furocoumarins (e.g., 8-ethyl-7-hydroxy-4-methylcoumarin gives 9-ethyl-2,3,5-trimethyl-7.ff, furo[3,2-g][l]benzopyran-7-one (75).230... [Pg.366]

This method is suited to the synthesis of natural benzofuran derivatives karanjin (111, R = R = H) (a furoflavone) and pongapin (111, RR = 0-CH2-0) have been prepared in this way,201 as well as khellin (26).315 From the chromone acetaldehyde (112), visnagin (113) (4-methoxy-7-methyl-5//-furo[3,2-g][l]benzopyran-5-one) was synthesized.310... [Pg.378]

The Reformatsky reaction has been applied to the synthesis of fused pyranones and provides an example of selective isomer formation by careful choice of substrate. Hydroxy-methylenecyclohexanone (315) and methyl bromoacetate give 5,6,7,8-tetrahydro-l-benzopyran-2-one (316) through alkylation at the hydroxymethylene carbon atom (54JA6388). However, the benzoyl derivative (317) is unable to form an enolate salt and alkylation occurs at the carbonyl carbon atom, leading to 5,6,7,8-tetrahydro-2-benzopyran-3-one (318) (45HCA771). [Pg.791]

The alkaloid reserpine [50-55-5], which is isolated from the roots of Raum/fta serpentina T., contains a gallate trimethyl ether moiety. Reserpine is used as an antihypertensive and a tranquilizer. A vinylogue of reserpine, rescinnamine [24815-24-5], is also an antihypersensitive (75). Methoxsalen [298-81-7] (8-methoxypsoralen 7H-9-methoxy-furo[3,2-[Pg.379]

Dimethyl-t-butylsiloxy-7H-furo[3,2-g][l]benzopyran-7-one (General method for preparing silyl-protected Bergaptol)... [Pg.444]

Other furocoumarins, although they have rather different structures, have very similar names, which gives rise to confusion. Thus, whereas oroselone (8) is 8-isopropenyl-2.ff-furo[2,3-A][l]benzopyran-2-one and oroselol (9) is 8-(l-hydroxy-l-methylethyl)-2. f-furo[2,3-A][l]benzopy-ran-2-one, oreoselone (10) is 2-isopropyl-2,3-dihydro-7jy-furo[3,2-gr][l]-benzopyran-3,7-2.ff-dione. ... [Pg.341]

See other pages where 2- -2//-l-benzopyran-2-one is mentioned: [Pg.465]    [Pg.646]    [Pg.2845]    [Pg.2845]    [Pg.391]    [Pg.1060]    [Pg.646]    [Pg.391]    [Pg.1060]    [Pg.52]    [Pg.1046]    [Pg.632]    [Pg.1341]    [Pg.108]    [Pg.925]    [Pg.1035]    [Pg.430]    [Pg.1203]    [Pg.148]    [Pg.363]    [Pg.162]    [Pg.185]    [Pg.521]    [Pg.513]    [Pg.521]    [Pg.351]    [Pg.346]    [Pg.1533]   
See also in sourсe #XX -- [ Pg.159 ]

See also in sourсe #XX -- [ Pg.229 ]



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2-H-l-Benzopyran-2-one

2H-l-Benzopyran-2-one,

4-hydroxy-2H-l-benzopyran-2-one

Benzopyran

Benzopyrane

Chromones (4H-l-benzopyran-4-ones

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