Furan, 3-hydroxy-1,2,3,4-tetraHYDRO

Furan 4-Brom-2,5-diethoxy-3-hydroxy-tetrahydro- V/4, 137 (HOBr-Add.) VII/1, 257 (HOBr-Add.)... [Pg.534]

Furan 2,5-Diethoxy-3-hydroxy-tetrahydro- VII/1, 257 Hexansaure rtreo-2,3-Dihydroxy-5-methyl- -methylester E13/2, 1167 (En-l,2-xyn-Dihydroxylie-rung)... [Pg.547]

Ethoxycarbonylmethyl-4-hydroxy-tetrahydro- VI/4, 67 2-Methoxy-3-methoxycarbonyl-6-methyl-tetrahydro- VI/2, 835 Tetrahydrofnran 2-Methoxy-3-(2-methoxycarbonyl-ethyl)- E21c, 2214 (4,5-H2 —furan/Hg2 + / H3C-OH + En)... [Pg.666]

Furan 3-(5-Chlor-2-nitro-phenyl)-2-hydroxy-tetrahydro- E14a/1, 620 (Lacton-Red.)... [Pg.724]

H-Cyclopenta[7,8]naphtho[2,3-6]furan-7-yl glyoxylate, 2,3,6,10-tetrahydro-6-hydroxy-6-methyl-3,10-dioxo-, methyl ester H NMR. 4, 560 (66JCS(C)743) Cyclopenta[6]quinoline, 6,7,8,9-tetrahydro- C NMR, 2, 122 (77JOC300, 77JOC2742)... [Pg.13]

The Cu(I)-catalyzed cyclization for the formation of ethyl ( )-tetrahydro-4-methylene-2-phenyl-3-(phenylsulfonyl)furan-3-carboxylate 82 has been accomplished starting from propargyl alcohol and ethyl 2-phenylsulfonyl cinnamate. Upon treatment with Pd(0) and phenylvinyl zinc chloride as shown in the following scheme, the methylenetetrahydrofuran 82 can be converted to a 2,3,4-trisubstituted 2,5-dihydrofuran. In this manner, a number of substituents (aryl, vinyl and alkyl) can be introduced to C4 <00EJO1711>. Moderate yields of 2-(a-substituted N-tosyIaminomethyl)-2,5-dihydrofurans can be realized when N-tosylimines are treated with a 4-hydroxy-cis-butenyl arsonium salt or a sulfonium salt in the presence of KOH in acetonitrile. The mechanism is believed to involve a new ylide cyclization process <00T2967>. [Pg.147]

Mono(2,6-dimethoxybenzoyl)tartaric acid Butanedioic acid, 2-[(2,6-dimethoxybenzoyl)oxy-3-hydroxy-, [R-(R, R )]- (12) (116212-44-3) 2,6-Dimethoxybenzoic acid Benzoic acid, 2,6-dimethoxy- (8,9) (1466-76-8) Trifluoroadetic anhydride Acetic acid, tritluoro-, anhydride (8,9) (407-25-0) Borane-Tetrahydrofuran Furan, tetrahydro-, compd. with borane (1 1) (8,9) (14044-65-6)... [Pg.48]

The electrohydroxylation of tetrahydro-furan [200, 201] and A-carbomethoxypyr-rolidine [202,203], in the presence of water, gives the corresponding 2-hydroxy derivatives. [Pg.375]

Furan-3-one, tetrahydro, 2-methyl LP Furocoumarin, angular, 4-hydroxy-2 -methoxy LP ... [Pg.5]

Several recent reviews have included specific types of electrophilic cyclofunctionalization reactions.1 Important areas covered in these reviews are halolactonization u cyclofunctionalization of unsaturated hydroxy compounds to form tetrahydrofurans and tetrahydropyrans lb cyclofunctionalization of unsaturated amino compounds lc cyclofunctionalization of unsaturated sulfur and phosphorus compounds ld lf electrophilic heterocyclization of unconjugated dienes 1 synthesis of y-butyrolactones 1 h synthesis of functionalized dihydro- and tetrahydro-furans lj cyclofunctionalization using selenium reagents lk lm stereocontrol in synthesis of acyclic systems 1" stereoselectivity in cyclofunctionalizations lP and cyclofunctionalizations in the synthesis of a-methylenelactones.lq Previous reference works have also addressed this topic.2... [Pg.364]

Simple allenes (209) react with dimethyldioxirane (200) to give the corresponding spiro-dioxides 210 in instances where diastereoisomeric spiro-dioxides are possible, there is usually an acceptable stereochemical preference for epoxidation to occur anti to the alkyl substituents324,325. Allenic alcohol 211 yields the highly functionalized tetrahydro-furan 212 and tetrahydropyran derivatives by intramolecular nucleophilic addition of the hydroxy group to an intermediate allene diepoxide324. [Pg.1179]

It has been demonstrated that the 4,5-dihydro-2-methylfuran, formed as an intermediate, hydrolyzes to 5-hydroxy-2-pentanone through the reaction sequence shown in Scheme 12.25.189,190,192 On the other hand, 5-hydroxy-2-pentanone was cyclodehy-drated to give 4,5-dihydro-2-methylfuran in yields of 86% or more in a continuous process in the presence of phosphoric acid (Scheme 12.25). Furan-2-carboxylic acid (2-furoic acid) was hydrogenated to the corresponding tetrahydro derivative in water over Skita s colloidal palladium at room temperature193 or over Raney Ni in ammo-niacal water at 130-150°C and 0.93 MPa H2 (eq. 12.99)194 or as its sodium salt in water at 110°C and 5.2 MPa H2.195... [Pg.548]

Cyclobutanol IV/4, 110 Cyclopropan 1 -Hydroxy-1 -methyl-XIIl/2a, 460, 462 E17a, 301 (R - COOR + TiX4/R - MgX) Ether Ethenyl-ethyl- Vl/ld, 147ff. Furan Tetrahydro- Vl/lb, 611 f. (Jeger-Reakt.) VI/3, 529/536 (Cyclokond.)... [Pg.167]

Amino-2,4-dioxo-3-propyl-1,2,3,4-tetrahydro- El5/2, 2228 [ —R —OH (Cyclokond.)] 6-Amino-4-hydroxy-5-(2-hydroxy-ethyl)-2-methyl- E9b/2, 158 (2-NH2 - 3-COOR - 4,5-H2 -furan + Acetamidin)... [Pg.398]

Bernsteinsaure (1-Hydroxy-1-methyl-ethyl)- (Terebansaure) E19a, 556 (En + 2-Propanol) Butandioate Dimethyl 3-Hydroxy-2-methyl- E21a, 733 (2-H - 2-CH3) Furan 2.5-Dimethoxy-3,4-methylen-dioxy-tetrahydro- E14a/1, 4-[3,4-(OH)2-THF + Br- CH2-C1] Monoperhexandisaure E13/1, 774 (Cl - O-OH)... [Pg.408]

Ethan 1-Butyloxy-l-formylamino-E14a/2, 147 (H - OR) Formamid N-(Butyloxy-methyl)-N-methyl- IV/lb, 1024 Furan 4-Dimethylamino-2-hydroxy-methyl-tetrahydro- VI/3, 573 Heptan... [Pg.425]

Furan 5-(2-Hydroxy-3-methyl-butyl)-2-(l-methoxycarbonyl-ethenyl)-tetrahydro- E21e, 4774 (6-OSiR3 —1,2-dien + CO/ R-OH kat.)... [Pg.1189]

Nitroselenenylation of alkenes141-149 is performed in a mixture of acetonitrile/tetrahydro-furan (compared to the nitromercuration reaction, this allows application to alkenes that may be insoluble in water) by the addition of phenylselenenyl halides, mercury(ii) chloride, and silver nitrite. Mercury chloride is necessary to significantly or completely suppress the formation of -hydroxy selenides due to the ambident character of the nitrite anion. [Pg.687]

Figure 5.2.11. Cellulose pyrolysate obtained at 59(P C and separated on a methyl silicone with 5% phenyl silicone type column. 1 acetic anhydride, 2 pentanal, 3 2-hydroxybutanedialdehyde, 4 1,4-dioxadiene, 5 tetrahydro-2-furanmethanol, 6 2-(hydroxymethyl)-furan, 7 3-methyl-2-hexanone, 8 2-methoxy-2,3-dihydrofuran, 9 2(5H)-furanone, 10 1-acetyloxypropan-2-one, 11 hydroxycyclopentenone, 12 5-methylfurfural, 13 2,3-dihydro-5-methylfuran-2-one, 14 1-cyclopentylethanone, 15 2-hydroxy-3-methyl-2-cyclopenten-1-one, 16 3,5-dimethylcyclopentan-1,2-dione, 17 unknown, 18 3-ethyl-2,4(3H,5H)-furandione, 19 6-methyl-1,4-dioxaspiro[2,4]heptan-5-one, 20 1-hydroxy-3,6-dioxabicyclo[3.2.1]octan-2-one, 21 1,4 3,6-dianhydro-a-D-glucopyranose, 22 5-(hydroxymethyl)-furfural, 23 4-cyclopenten-1,2,3-triol, 24 5-ethyl-3-hydroxy-4-methyl-tetrahydrofuran-2-one, 25 levoglucosan, 26 1,6-anhydro-p-D-glucofuranose.

Sikkimotoxin, 3a,4,9,9a-Tetrahydro-4-hydroxy-6,7-dunethoxy-9-(3,4,S-trimethoxyphenyt)naphtho 2,3-c -furan-I(3H) >ne 1 -hydroxy-2-hydroxymethyl-6,7-dimeth -oxy-4-(3 4 5 -trim ethoxy phenyl)-1,2,3,4-let rahydro-naphthalene-3-carboxylic acid lactone, C Hj p, mol wt 430.44. C 64.17%, H 6.09%, O 29.74%. Isoln from roots and rhizomes of Podophyllum sikkimeitsis R. Chatterjee et Mukerjee, Berberidaceae Chatterjee. Datta, Indian J. Physiol Allied Set 4, 6l (1950). Structnre Chatterjee. Chakra-varti, J. Am. Pharm. Assoc. Scl Ed. 4l, 415 (1952) Schreier, Helv. Chim. Acta 47, 1529 (1964). [Pg.1345]

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