synthesis of geminal derivatives of vinylcyclanes from new allylboranes with an exocyclic double bond

1987 ◽  
Vol 36 (1) ◽  
pp. 214-214
Author(s):  
Yu. N. Bubnov ◽  
V. I. Zheludeva
Keyword(s):  
Double Bond ◽  
Exocyclic Double Bond ◽  
Derivatives Of

Ozonolysis of Derivatives of Labda-8(17),14-dien-13-ol (Manool) and Their Conversion Into Large Ring Unsaturated Lactones

1988 ◽  
Vol 41 (5) ◽  
pp. 711 ◽  
Author(s):  
PK Grant ◽  
KL Chee ◽  
JS Prasad ◽  
MY Tho
Keyword(s):  
Double Bond ◽  
Good Yield ◽  
Spatial Relationship ◽  
Hydroxyl Group ◽  
Exocyclic Double Bond ◽  
Large Ring ◽  
Unsaturated Lactones ◽  
Derivatives Of

Dehydration of the unstable hydroperoxy ethers (4) and (6) formed on ozonolysis of the manool derivatives (2) and (5) resulted in the formation of the ten- membered unsaturated lactones (11) and (12) in good yield. The results of an investigation into the nature of the hydroxyl group and its spatial relationship to the exocyclic double bond in lactone formation are reported for other manool derivatives.

ChemInform Abstract: SYNTHESIS OF DERIVATIVES OF TRICYCLO(2.1.0.02,5)PENTANE WITH AN EXOCYCLIC DOUBLE BOND

1977 ◽  
Vol 8 (32) ◽  
pp. no-no
Author(s):  
N. S. ZEFIROV ◽  
N. V. AVERINA ◽  
A. M. BOGANOV ◽  
T. S. KUZNETSOVA ◽  
S. S. YAROVOI
Keyword(s):  
Double Bond ◽  
Exocyclic Double Bond ◽  
Derivatives Of

Biochemically important reactions of 2-furylethylenes. Reactions with low-molecular thiols

1982 ◽  
Vol 47 (5) ◽  
pp. 1523-1529 ◽  
Author(s):  
Ernest Šturdík ◽  
Tibor Liptaj ◽  
Štefan Baláž ◽  
Ľudovít Drobnica
Keyword(s):  
Biological Activity ◽  
Double Bond ◽  
Aqueous Medium ◽  
Exocyclic Double Bond ◽  
Nmr Analysis ◽  
Sh Groups ◽  
Derivatives Of

As evidenced by spectrophotometry and radiochromatography, derivatives of 2-furylethylene are able to react with thiols in an aqueous medium. The NMR analysis of reaction mixture showed that the site attacked by the thiol is the more electrophilic C(1) atom of the exocyclic double bond of the 2-furylethylenes under study. The ability to react with SH groups is of extraordinary importance particularly in connection with the study of mechanism of biological activity of 2-furylethylenes.

Chemistry of meso-Dimethylaminopropenyl- porphyrins and -bisporphyrins: the Synthesis of Australochlorin, a Benzochlorin Isomer.

1997 ◽  
Vol 50 (5) ◽  
pp. 487 ◽  
Author(s):  
Dmitry V. Yashunsky ◽  
Gelii V. Ponomarev ◽  
A. S. Moskovkin ◽  
Dennis P. Arnold
Keyword(s):  
Acetic Acid ◽  
Double Bond ◽  
Trifluoroacetic Acid ◽  
Membered Ring ◽  
Macrocyclic Complexes ◽  
Exocyclic Double Bond ◽  
Derivatives Of

The nickel(II) complex of meso-dimethylaminoprop-1-enyloctaethylporphyrin (2c) was converted by quaternization and thermolysis into a pair of novel isomeric macrocyclic complexes (3) and (4). These have a fused six-membered ring, and an exocyclic double bond on the neighbouring β-position, and have been named ‘australochlorins’. Heating these compounds in acetic acid leads to the known nickel(II) octaethylbenzochlorin (1) and a novel β-(1-acetoxyethyl)benzochlorin (5). Trifluoroacetic acid promotes the regioselective formation of benzochlorin/porphyrin species from the mononickel(II) complexes of the acrolein derivatives of bis(octaethylporphyrinyl)ethane and trans-ethene.

scholarly journals Synthesis of novel spiro-isoxazoline and spiro-isoxazolidine derivatives of tomentosin

RSC Advances ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 6523-6529 ◽  
Author(s):  
Mohamed Zaki ◽  
Abdelouahd Oukhrib ◽  
Mohamed Akssira ◽  
Sabine Berteina-Raboin
Keyword(s):  
Double Bond ◽  
Dipolar Cycloaddition ◽  
Exocyclic Double Bond ◽  
Enantiomerically Pure ◽  
Nitrile Oxides ◽  
Dittrichia Viscosa ◽  
Derivatives Of

A series of novel enantiomerically pure spiro-(isoxazolidines/isoxazolines) were synthesized regioselectively by 1,3-dipolar cycloaddition using nitrones and nitrile oxides, on the exocyclic double bond of tomentosin extracted from Dittrichia viscosa.

scholarly journals Stereoselective total syntheses of (±)-sinularene and (±)-5-epi-sinularene: a general intramolecular Diels–Alder approach to tricyclic sesquiterpenes

1985 ◽  
Vol 63 (4) ◽  
pp. 993-995 ◽  
Author(s):  
Kazimierz Antczak ◽  
John F. Kingston ◽  
Alex G. Fallis
Keyword(s):  
Double Bond ◽  
Methyl Ester ◽  
Total Synthesis ◽  
Ring System ◽  
Diels Alder ◽  
Exocyclic Double Bond ◽  
Total Syntheses ◽  
Methyl Group ◽  
Secondary Hydroxyl ◽  
Selective Hydrogenolysis

Stereoselective total synthesis of (±)-sinularene and (±)-5-epi-sinularene are described. The sequence employs a "blocked" cyclopentadiene in which the cyclopropane unit also serves as a latent methyl group. Thus intramolecular [4 + 2] cycloaddition of the substituted methyl spiro[2.4]hepta-4,6-dien-1-yl)-2-pentenoate 11 affords 5-benzyloxy-6-isopropyl-8-carbomethoxytetracyclo[5.4.01,7.02,4.02,9]undec-10-ene (12) which after selective hydrogenolysis generates the tricyclo[4.4.01,6.02,8]decane (sinularene) ring system. Removal of the secondary hydroxyl function (Ph3P/CCl4/CH3CN; H2/Pd/C), reduction of the methyl ester (LiAlH4), and introduction of the exocyclic double bond (acetate pyrolysis, 550 °C) completes the synthesis of (±)-sinularene in 14 steps from cyclopentadiene. A parallel series of reactions employing the isopropyl epimer of 12 affords (±)-5-epi-sinularene.

Formation of Dihydroaza-azulanones Possessing Spirocyclic Moieties: [8+2] Type Cycloaddition Reactions of Iminotropones to an Exocyclic Double Bond of 8-Oxoheptafulvene

Heterocycles ◽  
1995 ◽  
Vol 41 (10) ◽  
pp. 2181 ◽  
Author(s):  
Katsuhiro Saito ◽  
Yuka Saito ◽  
Masayuki Tomita ◽  
Hiroshi Taniguchi ◽  
Hirofumi Okabayashi
Keyword(s):  
Double Bond ◽  
Exocyclic Double Bond ◽  
Cycloaddition Reactions
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