Synthetic Approaches to 2-Methoxycysteine containing Peptides. The conversion of [(5S)-5-amino-5-carboxy-2-oxapentanoyl]-2-methoxy-(2S)-cysteinyl-(2R)-valine into 10-Oxa-6α-methoxyisopenicillin N by the Enzyme Isopenicillin N Synthase
作者:Jack E. Baldwin、Robert M. Adlington、Neil Moss
DOI:10.1016/s0040-4020(01)80113-7
日期:1989.1
Synthetic approaches to peptides containing 2-methoxycysteine and the direct enzymic synthesis of 10-oxa-6α-methoxyisopenicillin N (17) from N-[(5S)-5-amino-5- carboxy-2-oxapentanoyl]-2-methoxy-(2S)-cysteinyl-(2R)-valine are described.
A new enantioselective synthetic method for α-halo-α-alkylmalonates is reported. α-Alkylation of diphenylmethyl tert-butyl α-halomalonates under phase-transfer catalytic conditions (solid KOH, toluene, −40 °C) in the presence of (S,S)-3,4,5-trifluorophenyl-NAS bromide (5 mol%) afforded diphenylmethyl tert-butyl α-halo-α-alkylmalonates in very high chemical yields (up to 99%) and optical yields (up
Antineoplastic Agents. 570. Isolation and Structure Elucidation of Bacillistatins 1 and 2 from a Marine <i>Bacillus silvestris</i><sup>,</sup>
作者:George R. Pettit、John C. Knight、Delbert L. Herald、Robin K. Pettit、Fiona Hogan、Venugopal J. R. V. Mukku、John S. Hamblin、Michael J. Dodson、Jean-Charles Chapuis
DOI:10.1021/np800603u
日期:2009.3.27
cyclodepsipeptide strongly inhibited growth of a human cancer cell line panel, with GI50’s of 10−4−10−5 μg/mL, and each compound was active against antibiotic-resistant Streptococcus pneumoniae. The structures were elucidated by a combination of X-ray diffraction and mass and 2D NMR spectroscopic analyses, together with chemical degradation.
Penicillin biosynthesis the immediate origin of the sulphur atom
作者:Jack E. Baldwin、Robert M. Adlington、H-H. Ting、Duilio Arigoni、Paul Graf、Bruno Martinoni
DOI:10.1016/s0040-4020(01)96685-2
日期:1985.1
A mixture of tripeptide isotopomers δ-(L-α-aminoadipyl)-L-cystelnyl-D [2-2H]-valine and δ-(L-α-aminoadipyl)-L-(34S-cysteinyl)-D-valine were converted by the enzyme isopenicillin-N-synthetase into isopenicillin N. The distribution of the 2H and 34S in this product, determined by mass spectrometry, showed there was no transfer of the sulphur between the precursor molecules during conversion to penicillin
Synthesis ofL-?-aminoadipyl-L-serinyl-D-valine, a naturally occuring tripeptide from the fermentation ofPenicillium chrysogenum
作者:James E. Shields、Charles S. Campbell、K. Scott Doyle、Roger D. Miller、Norbert Neuss
DOI:10.1002/hlca.19810640814
日期:1981.12.16
A new tripeptide, L-α-aminoadipyl-L-seryl-D-valine has been synthesized by coupling the protected L-seryl-D-valine dipeptide with an appropriately protected L-α-aminoadipic acid ester. The free tripeptide was obtained after treatment with liquid HF and purification by HPLC.