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Furans ring opening

The 2,3-dihydrobenzo[l,2-7 5,4-3 ]difuran 705 can undergo a cycloaddition reaction with tetrazine 706 followed by furan ring opening and lactonizaton to afford the pyridazino-fused coumarin 707 (Scheme 174) <2005T4805>. Similarly, benzo[l,2-3 5,4-7 ]difurans 708 react with tetrazine 706 to form the pyridazino-fused coumarins 709 and 710 (Equation 283) <2005T4805>. [Pg.569]

At higher pressure the furan ring opens at either of the C—0 bonds, and the carbonyl group formed is simultaneously reduced to the alcohol. If the temperature is raised, dehydrogenation of the alcohols previously formed to ketones occurs and even larger yields of hydrocarbons are formed.209 The products obtained with Pd-Al skeleton catalysts at 250-275°,210 and with Ni-CdO catalysts at 300°,211 are... [Pg.416]

Hydrogen chloride/hydro gen peroxide Oxidative furan ring opening... [Pg.344]

Exanple 5, Furan ring opening-pyrrole ring closure ... [Pg.455]

In 1985 Whalley and co-workers reported the synthesis of pinselin (843) by a Lewis acid-mediated furan-ring opening/pyranone-ring closing of bromide 848, followed by oxidation of this alcohol, a-bromination, and aromatization with base to give pinselin (843) (588, 589) (Scheme 13.2)... [Pg.156]

Ring hydrogenation of furans—Reductive furan ring opening—Preferential hydrogenation of carbon-carbon double bonds s. 16, 86... [Pg.40]

D-Mannitol as reagent 17, 201 Marasse s. Kolbe-Schmitt Marckwald furan ring opening 7, 191 10, 136... [Pg.261]

Hydrogen chloride Mardiwald furan ring opening -Ketocarboxylic acid esters from furylcarbinols... [Pg.41]

Selective ring hydrogenation of isocyclics s. 13, 74 Reductive furan ring opening s. U, 74... [Pg.35]

See other pages where Furans ring opening is mentioned: [Pg.23]    [Pg.843]    [Pg.466]    [Pg.590]    [Pg.333]    [Pg.843]    [Pg.407]    [Pg.123]    [Pg.141]    [Pg.430]    [Pg.970]    [Pg.175]    [Pg.39]    [Pg.49]    [Pg.50]    [Pg.146]    [Pg.272]    [Pg.328]    [Pg.399]    [Pg.409]    [Pg.432]    [Pg.496]    [Pg.177]    [Pg.95]    [Pg.145]    [Pg.53]    [Pg.334]    [Pg.314]    [Pg.413]    [Pg.160]    [Pg.61]    [Pg.141]    [Pg.251]    [Pg.160]    [Pg.46]    [Pg.79]   
See also in sourсe #XX -- [ Pg.342 , Pg.349 ]

See also in sourсe #XX -- [ Pg.14 , Pg.15 , Pg.175 , Pg.562 ]



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Acid-catalyzed furan ring-opening

Benzo furan 3- lithio-, ring opening

Furan derivatives, ring opening

Furan ring opening, oxidative

Furans hydrolytic ring opening

Furans opening

Furans protonated, ring opening

Furans via cyclopropane ring opening

Furans, alkyl-, ring-opening

Ring Opening Reactions of Furans

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