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Abstract An asymmetric total synthesis of (+)-ivalin ( 4 ), a representative of antileukemic eudesmane sesquiterpenes, is described. The ene-aldehyde ( 6 ) was converted to the nearly optically pure… (More)
Potassium alum was crystallized by natural cooling in two well-mixed laboratory-scale (12.2 L) and pilot-scale (600 L) crystallizers. When unimodal product crystals of grown seeds were used, no… (More)
L-Tryptophan was synthesized from L-glutamic acid via L-glutamic-γ-semialdehyde derivatives with almost no racemization.
Abstract We carried out optical resolution of dl -methionine-ethyl-ester ( dl ) by the diastereomer method using acethyl- d -methionine ( d ′) as a resolving agent in order to elucidate the mechanism… (More)
Abstract The one-pot double alkylation reaction of a chiral α,β-unsaturated imine (6) with isopropenyl Grignard reagent followed by methyl iodide has been shown to proceed highly asymmetrically.… (More)
PURPOSE: To obtain di-tert-butyl dicarbonate which is useful as a protecting agent for amino groups in high yield from inexpensive starting substances. CONSTITUTION: The process for producing… (More)