An enantioselective synthesis of a key intermediate to thienamycin by chemicoenzymatic approach
作者:Harumi Kaga、Susumu Kobayashi、Masaji Ohno
DOI:10.1016/0040-4039(88)85334-6
日期:——
A keyintermediate to thienamycin is synthesized enantioselectively under complete stereo- and regio-chemical control starting from a chiral half ester 5 enzymatically generated.
硫霉素的关键中间体是在完全立体和区域化学控制下,从酶促生成的手性半酯5开始对映选择性合成的。
A new route to furanoeremophilane sesquiterpenoids. Synthesis of (±)-6β-hydroxyeuryopsin
作者:M. Sundaram Shanmugham、James D. White
DOI:10.1039/b311211j
日期:——
The naturally occurring furanoeremophilane 6[small beta]-hydroxyeuryopsin was synthesized by a novel route which involved Stille coupling of a 2-furylstannane with a cyclohexylmethyl bromide, followed by intramolecular formylation of the furan to complete the tricyclic nucleus of the sesquiterpenoid.
by NMR spectroscopy. In 2-(alkoxymethyl)phenylsilicon compounds with methoxy, hydrido or phenylgroups the silicon atom is assumed to be tetracoordinated. Pentacoordination is confirmed in trifluoro-[2-(methoxymethyl)phenyl]-silane (11) and trifluoro-[2-(isopropoxymethyl)phenyl]silane (12). The free energy of activation for ligand permutation at silicon in trifluoro-[2-(methoxymethyl)phenyl]silane