Borates, compositions comprising chiral (cyclic and acyclic) and achiral (cyclic and acyclic) borates; chiral (cyclic and acyclic) and achiral (cyclic and acyclic) biborates; and methods for their synthesis. Additionally, a significantly improved synthetic protocol for the synthesis of wide range of boronates starting from borates or biborates and Grignard or organolithium reagents that can be used for kilo lab and commercial scale production.
作者:M. G. Vinogradov、O. V. Mikhalev、V. A. Pavlov、V. A. Ferapontov、O. R. Malyshev、G. L. Heise
DOI:10.1023/a:1011307125755
日期:——
Asymmetric reduction of ketones with hydride complexes, which were prepared by in situ modification of NaAlH4, with various chiral amino alcohols or diamines, was studied. The highest enantioselectivity (up to 93% ee) was achieved using 2-(hydroxydiphenyl-methyl)pyrrolidine as a chiral inducing agent.
(EN) Novel chiral boron and aluminum hydride complexes, compositions comprising the chiral hydride complexes, and methods for their synthesis and use are described. The novel chiral hydride complexes are of the formulas: MBH4-n-a(R*)n(R')a; MBH2-b(R**)(R')b; MBH(R***); MBH(R*)(R''); MAlH4-n-a(R*)n(R')a; MAlH2-b(R**)(R')b; MAlH(R***); and MAlH(R*)(R''), wherein M is Na+, Li+ or K+; each R* is independently a monodentate chiral ligand; R** is a bidentate chiral ligand; R*** is a tridentate chiral ligand; R' is a monodentate achiral ligand; R'' is a bidentate achiral ligand; n is 1-3; a is 0-2; and b is 0-1, with the proviso that n + a $m(F) 3, and with the further proviso that when R** is S-BINOL, M is not Li+.(FR) L'invention concerne de nouveaux complexes d'hydrures de bore et d'aluminium chiraux, des compositions comprenant lesdits complexes d'hydrures chiraux et des méthodes de synthèse desdits complexes et compositions. Les nouveaux complexes d'hydrures chiraux répondent aux formules: MBH4-n-a(R*)n(R')a; MBH2-b(R**) (R')b; MBH(R3***); MBH(R*)(R''); MA1H4-n-a(R*)n(R')a; MA1H2-b(R**) (R')b; MA1H(R3***) et MA1H(R*)(R''), où M est Na+, Li+ ou K+; chaque R* est indépendamment un ligand chiral monodenté; R** est un ligand chiral bidenté; R*** est un ligand chiral tridenté; R' est un ligand achiral monodenté; R'' est un ligand achiral bidenté; n est 1-3; a est 0-2 et où b est 0-1, à condition que n + a $m(F) 3 et à condition également que lorsque R** est S-BINOL, M n'est pas Li+.