Asymmetric reduction of ketones with α-amino-ester boranes in the presence of Lewis acids

Chiral Borate Esters in Asymmetric Synth

Chiral Borate Esters in Asymmetric Synthesis. Part 2 : Asymmetric Borane Reduction of Prochiral Ketones in the Presence of a Chiral Spiroborate Ester

✍ Dejun Liu; Zixing Shan; Yan Zhou; Xiaojun Wu; Jingui Qin 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 German ⚖ 212 KB

## Abstract Asymmetric catalytic activity of the chiral spiroborate esters **1**–**9** with a O~3~BN framework (see __Fig. 1__) toward borane reduction of prochiral ketones was examined. In the presence of 0.1 equiv. of a chiral spiroborate ester, prochiral ketones were reduced by 0.6 equiv. of bor

Borane Reduction of the Steroid 20-Keton

Borane Reduction of the Steroid 20-Ketone Group in the Presence of Various Chiral β-Amino Alcohols

✍ Göndös, György ;Orr, James C. 📂 Article 📅 1993 🏛 John Wiley and Sons 🌐 English ⚖ 173 KB

## Abstract The direction of reduction of 20‐carbonyl group of 3α‐hydroxy‐5β‐pregnan‐20‐one (1) with a complex of borane‐methyl sulfide and chiral β‐amino alcohols, depends on the chirality of the amino alcohol. Where there is a 2‐phenyl or 2‐benzyl substituent, then the __S__ enantiomer gives excl

ChemInform Abstract: Asymmetric Reductio

ChemInform Abstract: Asymmetric Reduction of Acetophenone with Borane Catalyzed by Chiral Oxazaborolidinones Derived from L-α-Amino Acids.

✍ Shiwen Huang; Bo Wang; Zixing Shan; Deijie Zhao 📂 Article 📅 2000 🏛 John Wiley and Sons ⚖ 29 KB 👁 1 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v

ChemInform Abstract: Asymmetric Reductio

ChemInform Abstract: Asymmetric Reduction of Prochiral Ketones with Sodium Borohydride in the Presence of Amino Deoxy Sugars.

✍ L. SHARMA 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 27 KB 👁 2 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v

Asymmetric 1,4 addition of Grignard reag

Asymmetric 1,4 addition of Grignard reagents to chiral α,β-unsaturated esters in the presence of Lewis acids

✍ Giuliana Cardillo; Luca Gentilucci; Alessandra Tolomelli; Claudia Tomasini 📂 Article 📅 1999 🏛 Elsevier Science 🌐 French ⚖ 720 KB

The synthesis of enantiomerically enriched a-amino acids is described, by means of the diastereoselective conjugate addition of Grignard reagent to (S)-2-acetamidoacrylic ethoxycarbonylphenyl-methyl ester 1 and its N-Boo derivative 5 in the presence of Lewis acids. The addition of magnesium organocu

Dynamic Kinetic Resolution of α-Amino Ac

Dynamic Kinetic Resolution of α-Amino Acid Esters in the Presence of Aldehydes

✍ Daniel A. Schichl; Stephan Enthaler; Wolfgang Holla; Thomas Riermeier; Udo Kragl 📂 Article 📅 2008 🏛 John Wiley and Sons 🌐 English ⚖ 211 KB