Imidazolylidene carbene ligated palladium catalysis of the Heck reaction in the presence of air
作者:Jingping Liu、Yuanhong Zhao、Yongyun Zhou、Liang Li、Tony Y. Zhang、Hongbin Zhang
DOI:10.1039/b306715g
日期:——
Five 1,3-disubstituted imidazolium salts were synthesized. Their Heck reaction activities were evaluated. A convenient, efficient and high yielding procedure based on these compounds for the arylation of olefins was developed. Heck reactions mediated by these palladium–N-heterocyclic carbene complexes were conducted under air and even in the presence of several common oxidants.
Rhodium-Catalyzed Heck-Type Coupling of Boronic Acids with Activated Alkenes in an Aqueous Emulsion
作者:Mark Lautens、John Mancuso、Harpreet Grover
DOI:10.1055/s-2004-829161
日期:——
Intermolecular couplings between arylboronic acids and activated alkenes catalyzed by a water-soluble tert-butyl amphosrhodium complex were found to progress at room temperature and generated Heck-type products with high yields and excellent selectivity. Substitution on the alkene component encouraged the formation of products arising from a conjugate addition-protonation process. In the case of Heck
A concise synthesis of the naphthoic acid component of neocarzinostatin chromophore featuring a new photocyclization reaction
作者:Andrew G. Myers、Vijaya Subramanian、Marlys Hammond
DOI:10.1016/0040-4039(95)02268-6
日期:1996.1
A 6-step synthesis of the naphthoicacidcomponent of the natural antitumor agent neocarzinostatinchromophore is described. The synthetic route employs 4-bromo-3-methylanisole as the starting material, proceeds in 31–37% yield for the 6 steps, and features as the key step a photocyclizationreaction that is an interesting variant of known photocyclizationreactions of stilbenes and phenylbutadienes
Synthesis of analogues of calicheamicin and neocarzinostatin chromophore
作者:Alessandra Cirla、Angela R McHale、John Mann
DOI:10.1016/j.tet.2004.03.021
日期:2004.4
The work presents a synthetic route to the CD ring of calicheamicin and in the case of neocarzinostatin an approach to a functionalised cyclopentane-1,3-diol containing the naturally occurring naphthoate and a glucosamine motif. In the case of the NCS derivative some biological activity (cytotoxicity) was observed.
Development of an Enantioselective Synthetic Route to Neocarzinostatin Chromophore and Its Use for Multiple Radioisotopic Incorporation
作者:Andrew G. Myers、Ralf Glatthar、Marlys Hammond、Philip M. Harrington、Elaine Y. Kuo、Jun Liang、Scott E. Schaus、Yusheng Wu、Jia-Ning Xiang
DOI:10.1021/ja012487x
日期:2002.5.1
the diol 84 with the naphthoicacid 13 followed by selective cleavage of the chloroacetate protective group in situ to furnish the naphthoicacid ester 85 in 80% yield; and elimination of the tertiary hydroxyl group within intermediate 88 using the Martin sulfurane reagent (79% yield). Reductive transposition of the product epoxy alcohol (58) then formed neocarzinostatinchromophore aglycon (2, 71% yield)