scholarly journals Scalable Route to Chiral Phosphoramidites

2016 ◽  
Vol 8 (2) ◽  
pp. 64
Author(s):  
Sergiy G. Krasutsky ◽  
Sheila H. Jacobo
Keyword(s):  
General Structure ◽  
Conjugate Addition ◽  
Highly Efficient ◽  
Excellent Yield ◽  
Convenient Route ◽  
Pdf Format

The chiral copper-catalyzed conjugate addition is a well-developed methodology to create asymmetric C-C bonds. Many efforts have been dedicated to design efficient systems and identifying highly efficient ligands. Among the most proficient ligands, the ones possessing a bis-phenol or a bis-naphthol moiety are the most prominent. Herein we describe a scalable convenient route that can afford phosphoramidites in excellent yield.<br />Please find "Figure 1. General structure and application of phosphoramidites" in PDF format.

A Convenient Route to O-Glycosyl Lactates via Conjugate Addition to 2-Nitroglycals: Ring Closure to Novel Pyrano[2.3-b][1,4]-oxazines

Synthesis ◽  
2003 ◽  
Vol 2004 (01) ◽  
pp. 53-58
Author(s):  
Richard Schmidt ◽  
Ahmed Khodair ◽  
Kandasamy Pachamuthu
Keyword(s):  
Conjugate Addition ◽  
Ring Closure ◽  
Convenient Route

Sulfated polyborate: a new and eco-friendly catalyst for one-pot multi-component synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones via Biginelli reaction

2016 ◽  
Vol 40 (12) ◽  
pp. 10412-10417 ◽  
Author(s):  
Chetan K. Khatri ◽  
Deelip S. Rekunge ◽  
Ganesh U. Chaturbhuj
Keyword(s):  
Biginelli Reaction ◽  
Solvent Free ◽  
Synthetic Methodology ◽  
One Pot ◽  
Free Condition ◽  
Sulfated Polyborate ◽  
Highly Efficient ◽  
Excellent Yield ◽  
Solvent Free Condition

A highly efficient and improved synthetic methodology for the preparation of 3,4-dihydropyrimidin-2(1H)-one derivatives in good to excellent yield via Biginelli reaction of β-ketoesters/β-diketone, urea/thiourea and various aldehydes using new, efficient and recyclable sulfated polyborate catalyst under the solvent-free condition is reported.

Enantioselective conjugate addition of hydroxylamines to α,β-unsaturated 2-acyl imidazoles catalyzed by a chiral-at-metal Rh(iii) complex

2017 ◽  
Vol 4 (4) ◽  
pp. 573-577 ◽  
Author(s):  
Tao Deng ◽  
Ganesh Kumar Thota ◽  
Yi Li ◽  
Qiang Kang
Keyword(s):  
Amino Acid ◽  
Michael Addition ◽  
Conjugate Addition ◽  
Amino Acid Derivatives ◽  
Highly Efficient

A highly efficient chiral-at-metal Rh(iii) complex catalyzed asymmetric aza-Michael addition was developed, affordingN-protected β-amino acid derivatives with excellent enantioselectivity.

Highly efficient procedure for the conjugate addition of amines to electron deficient alkenes

2010 ◽  
Vol 51 (2) ◽  
pp. 225-228 ◽  
Author(s):  
An-ping Liao ◽  
Ping Lan ◽  
Mei Li ◽  
Li-hong Lan
Keyword(s):  
Conjugate Addition ◽  
Efficient Procedure ◽  
Highly Efficient

Cinchona alkaloid-based chiral catalysts act as highly efficient multifunctional organocatalysts for the asymmetric conjugate addition of malonates to nitroolefins

2015 ◽  
Vol 13 (40) ◽  
pp. 10216-10225 ◽  
Author(s):  
Veeramanoharan Ashokkumar ◽  
Ayyanar Siva
Keyword(s):  
Michael Addition ◽  
Quaternary Ammonium ◽  
Conjugate Addition ◽  
Quaternary Ammonium Salts ◽  
Cinchona Alkaloid ◽  
Ammonium Salts ◽  
Addition Reactions ◽  
Chiral Catalysts ◽  
Reaction Conditions ◽  
Highly Efficient

New pentaerythritol tetrabromide based chiral quaternary ammonium salts have been prepared and used as organocatalysts for enantioselective Michael addition reactions between various nitroolefins and Michael donors under mild reaction conditions with very good chemical yields and ee's.

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