C3-symmetric tripodal tetra-amines—preparation from chiral amino alcohols via aziridines
摘要:
Enantiopure N-sulfonylaziridines, conveniently obtained from readily available enantiopure amino alcohols, undergo smooth ring opening reactions using ammonia as a nucleophile to yield tripodal tetradentate C-3-symmetric amines. N-alkylation and subsequent removal of the sulfonyl groups provide access to alkyl-substituted analogs. (C) 1997 Elsevier Science Ltd.
Asymmetric Induction Reactions. VII. Palladium-Catalyzed Asymmetric .ALPHA.-Allylations of Carbonyl Compounds Using Chiral Sulfonamides as Chiral Ligands.
A series of (β-N-sulfonylaminoalkyl)phosphine ligands has been developed and employed for asymmetric palladium-catalyzed hydrosilylation and Heck-type hydroarylation, affording up to 72% ee and 90% yield.
A new disulfonamide prepared from α-amino acid in five steps catalyzed cyclopropanation of allylic alcohols with Et2Zn and CH2I2 to afford the corresponding cyclopropylmethanols in moderate to good enantioselectivites. In particular, the reaction of cinnamyl alcohol in the presence of a chiral disulfonamide 1 k afforded an excellent enantioselectivity (85% ee).
由α-氨基酸在五个步骤中制备的新的二磺酰胺催化烯丙基醇与Et 2 Zn和CH 2 I 2的环丙烷化,得到相应的环丙基甲醇,为中等至良好的对映体选择性。特别地,肉桂醇在手性二磺酰胺1k的存在下的反应提供了优异的对映选择性(85%ee)。
Asymmetric Hydrosilylation of Cyclopentadiene and Styrene with Chlorosilanes Catalyzed by Palladium Complexes of Chiral (β-<i>N</i>-Sulfonylaminoalkyl)phosphines
作者:Toshimi Okada、Toshiaki Morimoto、Kazuo Achiwa
DOI:10.1246/cl.1990.999
日期:1990.6
It was found that the palladiumcomplexes of newly prepared chiral (β-aminoalkyl)phosphine derivatives bearing N-sulfonyl groups were efficient catalysts for asymmetric hydrosilylations of cyclopentadiene and styrene with chlorosilanes.