Takeshi Kuri   Yoshihiko Mizukami   Mio Shimogaki   Morifumi Fujita   
Organic Letters 22(19) 7613-7616 2020年10月 [査読有り]
An oxetane intermediate during a direct aldol reaction was trapped with an internal aryl group to yield trans-tetraline products. The contribution of the oxetane intermediate was confirmed by 18O-isotope labeling experiments.
<p>The substitutions at the 2′- and/or 6′-positions of the quinoline ring of cinchonidine reduce both the intrinsic enantioselectivity and adsorption strength for the enantioselective hydrogenation of α-phenylcinnamic acid over Pd/C.</p>
Alkylidenecyclopropanone sityl acetals are readily available from the reaction of an alkylidenemethyliodonium salt and ketene silyl acetals in the presence of triethylamine. The three different C-C bonds of the cyclopropane ring can be selectively...
M Fujita   WH Kim   Y Sakanishi   K Fujiwara   S Hirayama   T Okuyama   Y Ohki   K Tatsumi   Y Yoshioka   
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 126(24) 7548-7558 2004年6月
The reaction of 4-substituted cyclohex-1-enyl(phenyl)iodonium tetrafluoroborate with tetrabutylammonium acetate gives both the ipso and cine acetate-substitution products in aprotic solvents. The isomeric 5-substituted iodonium salt also gives the...
M Fujita   WH Kim   Y Sakanishi   K Fujiwara   S Hirayama   T Okuyama   Y Ohki   K Tatsumi   Y Yoshioka   
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 126(24) 7548-7558 2004年6月
The reaction of 4-substituted cyclohex-1-enyl(phenyl)iodonium tetrafluoroborate with tetrabutylammonium acetate gives both the ipso and cine acetate-substitution products in aprotic solvents. The isomeric 5-substituted iodonium salt also gives the...
M Fujita   K Ihara   WH Kim   T Okuyama   
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 76(9) 1849-1855 2003年9月
Solvolysis of 4-methylcyclohexylidenemethyl(phenyl)iodonium tetrafluoroborate (1) and its R isomer (69% ee) was carried out in 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoropropan-2-ol (HFP) in the presence of bases such as acetate, pyrid...
M Fujita   K Ihara   WH Kim   T Okuyama   
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 76(9) 1849-1855 2003年9月
Solvolysis of 4-methylcyclohexylidenemethyl(phenyl)iodonium tetrafluoroborate (1) and its R isomer (69% ee) was carried out in 2,2,2-trifluoroethanol (TFE) and 1,1,1,3,3,3-hexafluoropropan-2-ol (HFP) in the presence of bases such as acetate, pyrid...