Naturally occurring linear fused thiazoline-thiazole containing metabolites: total synthesis of (–)-didehydromirabazole A, a cytotoxic alkaloid from blue–green algae
作者:Gerald Pattenden、Stephen M. Thom
DOI:10.1039/p19930001629
日期:——
A concise totalsynthesis of the thiazoline-thiazole containingmetabolite didehydromirabazole A 1 is described. The synthesis uses the unusual amino acid (R)-2-methylcysteine 20 in sequential cyclocondensations with imino ethers as key steps, viz22→32 and 37→38.
The synthesis of a series of 2-thiazolines was carried out under mild conditions from the corresponding thiazolidines, by a Ru-catalyzed/TBHP oxidation reaction conditions. The reaction was chemoselective towards the amine-imine oxidation and was also regioselective, affording the unsaturation at the 2-position of the heterocycle, even with thiazolidine substrates bearing ester groups at the 4-position
Concise synthesis of 2,4-disubstituted thiazoles from β-azido disulfides and carboxylic acids or anhydrides: asymmetric synthesis of cystothiazole C
作者:Yi Liu、Xue Sun、Xing Zhang、Jun Liu、Yuguo Du
DOI:10.1039/c4ob01460j
日期:——
A novel and efficient method for the one-pot synthesis of 2,4-disubstituted thiazoles from carboxylic acids or anhydrides is presented. Based on this new method, the total synthesis of the bis-2,4-disubstituted bis(thiazoles) natural product cystothiazole C is also presented.