申请人:The Board of Regents for the Oklahoma Agricultural and Mechanical
公开号:US04826984A1
公开(公告)日:1989-05-02
Novel heteroarotinoid compositions characterized by the formulae: ##STR1## where R is H, CH.sub.3 or C.sub.2 H.sub.5 and X is S, S O, O, NCH.sub.3, Si(CH.sub.3).sub.2, N.sup.+ (H)CH.sub.3 [Cl.sup.- ], N.sup.+ (H)CH.sub.3 [Br.sup.- ] or N.sup.+ (alkyl) CH.sub.3 [Cl.sup.- or Br.sup.-) where alkyl is CH.sub.3, C.sub.2 H.sub.5, CH.sub.2 .dbd.CHCH.sub.2 or C.sub.6 H.sub.5 CH.sub.2. Such compositions exhibit activity as anticancer agents.
Preparation of thiochromans<i>via</i>thermal cyclization
作者:Anton W. Jensen、Joan Manczuk、David Nelson、Onalee Caswell、Steven A. Fleming
DOI:10.1002/jhet.5570370619
日期:2000.11
Formation of the thiochroman ringsystem is achieved by a two step synthesis that involves heating 3-thiophenyl-1-propanols or 4-thiophenyl-2-butanols in toluene with catalytic amounts of p-toluenesulfonic acid. The propanols are made by the addition of sulfur stabilized carbanions to styrene oxide, ethylene oxide, propylene oxide, and isobutylene oxide. The carbanions are generated by treatment of
Gas-phase pyrolytic reaction of 3-phenoxy and 3-phenylsulfanyl-1-propanol derivatives: Kinetic and mechanistic study
作者:H. H. Dib、M. R. Ibrahim、N. A. Al-Awadi、Y. A. Ibrahim、S. Al-Awadi
DOI:10.1002/kin.20276
日期:2008.2
system. Pyrolysis of 4-phenyl-1-butanol 3, 2-methyl-3-phenyl-1-propanol 4, and 2-methyl-3-phenylpropanoic acid 5 was also studied, and results were compared with those obtained for compounds 1–3. The pyrolytic reactions were homogeneous and followed a first-order rate equation. Analysis of the pyrolysate showed the products to be phenol (from 1a to 1c), thiophenol (from 2a to 2c), and toluene (from 3 to
申请人:The Board of Regents for the Oklahoma Agricultural and Mechanical
公开号:US04977276A1
公开(公告)日:1990-12-11
Novel heteroarotinoid compositions characterized by the formulae: ##STR1## where: X is S or O; OAc is the acetate group ##STR2## and R is --H, --OH, --OCH.sub.3, or --OC.sub.2 H.sub.5 and includes ##STR3## for formulae (1) and (2). Such compositions exhibit activity as anticancer agents.
Synthesis of side-chain homologated analogs of 1,25-dihydroxycholecalciferol and 1,25-dihydroxyergocalciferol
作者:M CHODYNSKI、A KUTNER
DOI:10.1016/0039-128x(91)90052-w
日期:1991.6
A novel synthesis of side-chain homologated analogs of vitamin D isomers has been described. The synthesis allows for the insertion of the double bond into the C-24 position of the side chain. The key synthetic step involves the coupling of a new C24-vitamin D synthon with the respective side-chain fragment. The method is illustrated by the preparation of (24E)-24,24a-dehydro-24,24-dihomo-1,25-dihydroxycholecalciferol (1) and (24b R)- and (24b S)-24,24-dihomo-1,25-dihydroxyergocalciferols (2 and 3). Trans geometry of the newly formed double bond in the side chain was confirmed by high field nuclear magnetic resonance spectra.