Microwave-assisted synthesis of the (E)-α-methylalkenoate framework from multifunctionalized allylic phosphonium salts
作者:Lidiane Meier、Misael Ferreira、Marcus M. Sá
DOI:10.1002/hc.21001
日期:——
A convenient and general microwave-assisted method for the synthesis of stereochemicallydefined α-methylalkenoic acids and esters from allylic phosphonium salts in a basic aqueous medium is described. A selective preparation of acids or esters was dependent on the base (NaOH or NaHCO3) employed in the reaction and could be achieved with good to excellent yields under mild conditions in the absence
A series of 28 aryl- and alkyl-substituted isothiouronium salts were readily synthesized in high yields through the reaction of allylic bromides with thiourea, N-monosubstituted thioureas or thiosemicarbazide. The S-allylic isothiouronium salts substituted with aliphatic groups were found to be the most effective against leukemia cells. These compounds combine high antitumor activity and low toxicity
Mild and practical stereoselective synthesis of (Z)- and (E)-allyl bromides from Baylis–Hillman adducts using Appel agents (PPh3/CBr4): a facile synthesis of semiplenamides C and E
Appel agents (PPh3/CBr4) have been utilized for high-yielding stereoselective synthesis of (Z)- and (E)-allyl bromides from Baylis–Hillman adducts at room temperature. The method has been applied for the synthesis of naturallyoccurring bioactive fatty acid amides, semiplenamides C and E.
作者:Ko Hoon Kim、Cheol Hee Lim、Jin Woo Lim、Jae Nyoung Kim
DOI:10.1002/adsc.201301169
日期:2014.3.10
An efficient intramolecular arene‐alkene oxidativecoupling of 1,4‐diaryl‐1,3‐butadienes has been developed involving the use of a 2,3‐dichloro‐5,6‐dicyano‐para‐benzoquinone (DDQ)/acid catalyst. The reaction involves the generation of a radical cation by abstraction of an electron from the substrate with DDQ, an intramolecular Friedel–Crafts‐type reaction, and the loss of hydrogen radical.
Expedient Synthesis of N-Fused Indoles through an Intramolecular [3+2]-Cycloaddition Approach
作者:Raghavachary Raghunathan、Subban Kathiravan
DOI:10.1055/s-0029-1219551
日期:2010.4
A variety of N-fused indolo pyrrolo-pyrroles and pyrrolo-pyrrolizidines were synthesized by intramolecular 1,3-dipolar cycloaddition reaction of azomethine ylide generated from N-alkenylindole carbaldehyde which were prepared by the N-alkylation of indole 2-aldehyde with Baylis-Hillman bromides.