Tetrahydro-2-pyranyl

Brom-3-methoxy-2-methyl-propyl)- -dinitril E19a, 1058 [R — Br + En (rad.)] lH-Pyrazol 4-Brom-l-(tetrahydro-2-pyranyl)- E8b, 607 (1-H -+ 1-R)... [Pg.497]

Imidazol 2-Nitro-l-(tetrahydro-2-pyranyl)- E14a/2, 392 (Enol-ether + N-Hetaren)... [Pg.504]

Pyrimidine 2,4-Dioxo-5-fluoro-l-(3-fluoro-tetrahydro-2-pyranyl)-hexahydro- E10 (3-H - 3-F)... [Pg.610]

Auch der als Schutz-Gruppe verwendete Tetrahydro-2-pyranyl-Rest besitzt N,0-Acetal-Struk-tur und entsteht durch Addition von 1-unsubstituierten lH-Pyrazolen an 3,4-Dihydro-2H-pyran z.B.1866. [Pg.607]

Mit 2,3-Dihydro-furanen Oder 3,4-Dihydro-2H-pyranen werden l-(Tetrahydro-2-furyl)-oder 1-(Tetrahydro-2-pyranyl)-lH-indazole in Ausbeuten von 55-89% gebildet657 ... [Pg.829]

Hr CIIj-O-CO-CHj 2 J-[6-(Aeetoxy-methyl)-tetrahydro-2-pyranyl -5-krom-... [Pg.830]

Tetrahydro-2-furyl)- 829, 830 l-(Tetrahydro-2-pyranyl)- 829 1 -(2,3,5-Tri-O-acetyl- -D-riboruranosyl)- 827 l-Trichlormethansulfonyl-6-nitro- 820 3-Trifluormethyl- 770 1-Trimethylgermyl- 836 1-Trimethylsilyl- 836, 840 l-(2,4,6-Trinitro-phenyl)- 832... [Pg.1198]

Methyl-3-keto-l-pentanol tetrahydro-2-pyranyl ether added at 0-3° during 0.5 hr. to a tetrahydrofuran soln. of (+)-di(isopinocampheyl)borane prepared from di-borane and (—)-a-pinene, stirred overnight at 6-7°, excess hydride decomposed with water, 3 N NaOH followed by 30%-H2O2 added with cooling, and stirred 1.5 hrs. at ca. 40° -> (+)-4-methyl-l-(3R)-dihydroxypentane l-tetrahydro-2-pyranyl ether. Y 91.4%. - Also prepn. of the (—) isomer with (+)-a-pinene and the (+)-(3R)-3-Di-compound with deuteriodiborane prepared from NaBD4 s. E. Caspi and K. R. Varma, J. Org. Chem. 33, 2181 (1968). [Pg.26]

Hydrogen chloride Protection of phenol groups as tetrahydro-2-pyranyl ethers... [Pg.53]

The (fl)-(-)-enantiomers of (z)- and (E)-14-methy1 -8-hexadecen-1-ol, pheromones of Tvogod Tma, have been obtained by coelectrolysis of ()-(-)-4-methy1hexanoic acid (45) and 12- tetrahydro-2-pyranyl-oxy)-4-dodecynoic acid (46) followed by stereospecific hydrogenation of (47). ... [Pg.82]

Startg. tetrahydro-2-pyranyl ether treated with Ph3P/CBr4 in dichloromethane at room temp, according to Tetrahedron Letters 30, 557-8 (1989) -+ product. Y 85%. The method was applicable to a variety of O-protected 3- or 4-ethylenealcohols. F.e. and with Ph3P/Br2 s. A. Wagner et al., Tetrahedron Letters 30, 1971-4 (1989). [Pg.436]

Birch reduction of tetrahydro-2-pyranyl ethers Protection of hydroxyl groups Sec. alcohols from ketones... [Pg.37]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...