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A new sulfolipid, KM043, which belongs to the 6-sulfo-alpha-D-quinovopyranosyl-(1-->3')-1',2'-diacylglycerol (SQDG) class of compounds, has been isolated from a marine red alga, Gigartina tenella, as… (More)
We found and previously reported a new mammalian DNA polymerase inhibitor from a sea alga, Gigartina tenella, (Ohta K., et al., Chem. Pharm. Bull., 46, 684-686, 1998). It was a new sulfolipid… (More)
A carrier for a new tumor imaging agent, a bifunctional chelating agent (BCA)-coupled porphyrin (ATN-2), has been synthesized from protoporphyrin dimethyl ester in 4 steps. At first, the… (More)
A catalytic and highly enantioselective intramolecular [4+2] cycloaddition of dieneynes was achieved by use of chiral iridium complex prepared in situ from [IrCl(cod)] 2 and BDPP… (More)
Highly enantioselective addition of diketene to aldehydes was achieved by using novel Schiff base-titanium alkoxide complexes. Up to 92% ee of 5-hydroxy-3-oxoesters was obtained. This procedure… (More)
Abstract A nitroaldol reaction (Henry reaction) proceeded under mild conditions with the aid of a catalytic amount of tris(2,4,6‐trimethoxyphenyl)phosphine (TTMPP) to afford β‐nitro alkanol in high… (More)