Enantioselective Thiourea-Catalyzed Additions to Oxocarbenium Ions
作者:Sarah E. Reisman、Abigail G. Doyle、Eric N. Jacobsen
DOI:10.1021/ja801514m
日期:2008.6.1
Asymmetric, catalytic reactions of oxocarbeniumions are reported. Simple, chiral urea and thiourea derivatives are shown to catalyze the enantioselective substitution of silyl ketene acetals onto 1-chloroisochromans. A mechanism involving anion binding by the chiral catalyst to generate a reactive oxocarbeniumion is invoked. Catalysts bearing tertiary benzylic amide groups afforded highest enantioselectivities
Phenylphosphinic Acid-Promoted Addition of Isocyanide to 1-Methoxyisochroman Derivatives
作者:Takahiro Soeta、Yutaka Ukaji、Syunsuke Matsuzaki
DOI:10.3987/com-18-s(t)23
日期:——
A synthetic method for preparation of isochroman-1-carboxylamides in good to high yields by addition of isocyanides to 1-methoxyisochroman derivatives in the presence of phosphinic acid was developed. A wide range of 1-methoxyisochroman derivatives and isocyanides were suitable for this reaction.
ISOBE, KIMIAKI;TAKEDA, NAOKO;MOHRI, KUNIHIKO;TSUDA, YOSHISUKE, CHEM. AND PHARM. BULL., 37,(1989) N2, C. 3390-3392