Convenient General Asymmetric Synthesis of Roche Ester Derivatives through Catalytic Asymmetric Hydrogenation: Steric and Electronic Effects of Ligands
and concise asymmetrichydrogenation of acrylate esters promoted by the cationic ruthenium monohydride complex [Ru(H)(η6-cot)SYNPHOS]+BF4− is reported. A full investigation of the effects of catalyst precursors, solvents, temperature, hydrogen pressure, substrates as well as steric and electronic properties of ligands was carried out. The corresponding valuable Rocheesterderivatives were obtained
Chemoenzymatic synthesis of ferrulactone II and (2E)-9-hydroxydecenoic acid
作者:Archana S. Pawar、S. Sankaranarayanan、Subrata Chattopadhyay
DOI:10.1016/0957-4166(95)00296-2
日期:1995.9
A novel and divergent synthesis of the title compounds has been developed. The salient features of the synthesis were use of easily accessible starting material, regioselective organometallic reaction and enzymatic derivation of the key synthons.
Novel synthesis of a 1,4-dienic macrolide pheromone of Cucujid grain beetles
作者:A. S. Pawar、S. Chattopadhyay、A. Chattopadhyay、V. R. Mamdapur
DOI:10.1021/jo00078a036
日期:1993.12
C-alkylation of 4-pentyn-1-ol (1) with 1-bromo-5-(tetrahydropyranyloxy)pentane, subsequent cis-hydrogenation, and PDC oxidation gave the C10 aldehyde 5. Its Wittig-Horner olefination, base-catalyzed deconjugation to the corresponding (3Z) compound, and enzymatic macrolactonization furnished (3Z,6Z)-dodecanolide (1).