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WATARU NAGATA Profile and Scientific Contributions of Doctor Kenichi Tokeda
SEIICHI TAKANO MASAAKI SATO SUSUMI HATAKEYAMA MICH1YASU HIRAMA
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acetic acetonitril acid addition adducts afforded alcohol alkaloids Amer analogs anhydride anion aqueous aromatic H ASIS assigned atom benzene beta-lactam carbon carbonyl catalyst chart Chem chemical shifts Chemistry chloride chromatography cleavage CM CM compounds configuration corresponding cyclization derivatives diastereomers diimide dimethyl disulfide double bond doublet E. J. Corey enzyme ester ether formation gave give Heterocycles hydrazine hydrogen hydrogenolysis hydrolysis ibid intermediate intramolecular irradiation isocyanate isolated isomer isomerization Japan Kametani ketone labeled Laboratory lactam lactone mass spectrum methanol methyl methylene mixture nmr spectrum obtained olefinic oxidation oxygen peak Pharm phenyl potassium prepared presence protons pyridine racemate reaction reagent rearrangement reduction reflux reported ring room temperature Scheme Shionogi signal singlet sodium solution solvent spectra spectral data stereochemistry steric steroid structure substituted sulfur Table Takeda Tetrahedron Letters total synthesis treatment undergo yield