85613-04-3Relevant articles and documents
Synthesis of methoxylated goniothalamin, aza-goniothalamin and γ-pyrones and their in vitro evaluation against human cancer cells
Barcelos, Rosimeire Coura,Pastre, Julio Cezar,Caixeta, Vanessa,Vendramini-Costa, Débora Barbosa,De Carvalho, Jo?o Ernesto,Pilli, Ronaldo Aloise
experimental part, p. 3635 - 3651 (2012/07/27)
The present work describes the preparation of three novel series of compounds based on the structure of goniothalamin, a natural styryl lactone which has been found to display cytotoxic and antiproliferative activities against a variety of cancer cell lines. A focused library of 29 novel goniothalamin analogues was prepared and evaluated against seven human cancer cell lines. While the γ-pyrones and the aza-goniothalamin analogues were less potent than the lead compound, 2,4-dimethoxy analogue 88 has shown to be more potent in vitro than goniothalamin against all cancer cell lines evaluated. Furthermore, it was more potent than doxorubicin against NCI-ADR/RES, OVCAR-03 and HT-29 while being less toxic to human keratinocytes (HaCat). The 3,5-dimethoxy analogue 90 and 2,4,5-trimethoxy analogue 92 also displayed promising antiproliferative activity when compared to goniothalamin (1). These results provide new elements for the design and synthesis of novel representatives of this family of natural compounds.
Competitive [2,3]-and [1,2]-oxonium ylide rearrangements. Concerted or stepwise?
Jaber, Deana M.,Burgin, Ryan N.,Helper, Matthew,Zavalij, Peter Y.,Doyle, Michael P.
supporting information; experimental part, p. 1676 - 1679 (2012/06/30)
The axial-equatorial conformational isomer distribution of the reactant diazoacetoacetate or its metal carbene intermediate is reflected in Rh(II) catalyzed oxonium ylide forming reactions of 3-(trans-2-arylvinyl) tetrahydropyranone-5-diazoacetoacetates that afford diastereoisomeric products for both the symmetry-allowed [2,3]-and the formally symmetry-forbidden [1,2]-oxonium ylide rearrangements.
A Lewis Base-catalyzed hetero Diels-Alder reaction between aldehydes and the Danishefsky's diene
Mukaiyama, Teruaki,Kitazawa, Takayuki,Fujisawa, Hidehiko
, p. 328 - 329 (2007/10/03)
A lithium methoxide-catalyzed hetero Diels-Alder reaction of aromatic and aliphatic aldehydes with 1-methoxy-3-trimethylsilyloxy-1,3-butadiene (Danishefsky's diene) is described. It proceeds through the Mukaiyama-Aldol reaction pathway and affords the cor
Hetero diels-alder type reactions between danishefsky's dienes in the presence of lewis base catalysts. An efficient method for the synthesis of substituted 2,3-dihydropyran-4-ones
Kitazawa, Takayuki,Mukaiyama, Teruaki
, p. 417 - 427 (2008/02/09)
Alkoxy anion such as methoxide anion works effectively as Lewis base catalyst to activate silicon-carbon bond of 1-methoxy-3-trimethylsilyloxy-1,3-butadiens (Danishefsky's dienes) in the reaction between aldehydes and ketones. By using Lewis base as catal
Dramatically synergetic effect of carboxylic acid additive on tridentate titanium catalyzed enantioselective hetero-Diels - Alder reaction: Additive acceleration and nonlinear effect
Yuan, Yu,Long, Jiang,Sun, Jie,Ding, Kuiling
, p. 5033 - 5042 (2007/10/03)
This paper describes the successful development of a group of highly efficient chiral tridentate titanium catalysts for hetero-Diels -Alder reaction of Danishefsky's diene and a variety of aldehydes through ligand and additive diversity. Dramatically syne
Asymmetric cycloaddition reactions
-
, (2008/06/13)
The present invention relates to a process for stereoselective cycloaddition reactions which generally comprises a cycloaddition reaction between a pair of substrates, each either chiral or prochiral, that contain reactive π-systems, in the presence of a
Diiodosamarium, a Catalyst Precursor for Diels-Alder and Hetero Diels-Alder Reactions.
Weghe, Pierre Van de,Collin, Jacqueline
, p. 2545 - 2548 (2007/10/02)
SmI2 presents catalytic activity for Diels-Alder reactions between cyclopentadiene or isoprene and various dienophiles, and for hetero Diels-Alder reactions.
ON THE MECHANISM OF THE LEWIS ACID CATALYZED CYCLOCONDENSTION OF ALDEHYDES WITH SILOXYDIENES
Larson, Eric R.,Danishefsky, Samuel
, p. 1975 - 1978 (2007/10/02)
Competing cycloaddition versus aldolization-cyclization processes are demonstrated in the formation of 6-styryl-5,6-dihydro-γ-pyrone via the BF3 catalyzed reaction of cinnamaldehyde with trans-1-methoxy 3-trimethylsilyloxy-1,3-butadiene.