Enantioselective vinylogous aldol reaction of acylphosphonates with 3-alkylidene oxindoles
作者:Manish K. Jaiswal、Sanjay Singh、Ravi P. Singh
DOI:10.1039/d1ob00140j
日期:——
phosphonates has been described. The hydrogen bonding ability of the bifunctional thiourea catalyst allows simultaneous dual activation of a vinylogous oxindole nucleophile and an acylphosphonate electrophile, affording hydroxyphosphonato-3-alkylidene-2-oxindoles as aldol adducts in high yields (up to 92%) with excellent stereocontrol (up to 99% ee).
Studies on Organophosphorus Compounds, 53: A New Procedure for the Synthesis of 1-Alkyl or 1-Aryl-1-hydroxy-2-nitroethylphoshonates under PTC Conditions
A series of dialkyl 1-alkyl- or 1-aryl-1-hydroxy-2-nitroethyl-phosphonates and 1-hydroxy-1-(nitromethyl)alkylphosphonates was prepared by nucleophilic addition of nitromethane to dialkyl acylphosphonates in the presence of potassium carbonate and tetrabutylammonium bromide.
Organocatalytic Highly Enantioselective Nitroaldol Reaction of α-Ketophosphonates and Nitromethane
作者:Tanmay Mandal、Sampak Samanta、Cong-Gui Zhao
DOI:10.1021/ol070209i
日期:2007.3.1
[reaction: see text] The first organocatalytichighlyenantioselective nitroaldol reaction of alpha-ketophosphonates and nitromethane has been realized by using cupreine (2) or 9-O-benzylcupreine (3) as the catalyst. Both catalysts are highly reactive and highlyenantioselective. alpha-Hydroxy-beta-nitrophosphonates have been synthesized in good yields and excellent enantioselectivities (>or=90% ee) at a low
Studies on Organophosphorus Compounds; 99: A Novel Stereoselective Synthesis of Dialkyl (Z)-1-Alkyl-2-ethoxycarbonyl-2-formylaminoeth-1-enylphosphonates
作者:Weisheng Huang、Yixin Zhang、Chengye Yuan
DOI:10.1055/s-1997-1164
日期:1997.2
Cu2O-Catalyzed reaction of ethyl isocyanoacetate with dialkyl 1-oxoalkylphosphonates afforded predominantly dialkyl (Z)-1-alkyl-2-ethoxycarbonyl-2-formylaminoeth-1-enylphosphonates.
Synthesis of tertiary propargylic phosphonates by addition of trialkynylaluminum reagents to acyl phosphonates and investigation of their antimicrobial activities
A series of propargylic alcohols containing phosphonates was synthesized by addition reactions of tris-(propynyl) and tris-(phenylethynyl)aluminum reagents to acyl phosphonates in good yields. Aromatic moieties of the acyl phosphonates with electron-withdrawing groups generally resulted in better isolated chemical yield. Selected propargylic phosphonates were tested for antimicrobial activities. Compounds