Catalytic Divergent Synthesis of 3H or 1H Pyrroles by [3 + 2] Cyclization of Allenoates with Activated Isocyanides
摘要:
The cyclization of allenoates with activated isocyanides was reported for the first time. While Ag catalysis led to an unprecedented enantioselective synthesis of 3H pyrroles, a simple procedure using PPh3 produced a wide range of polysubstituted 1H pyrroles with high efficiency.
Divergent, Enantioselective Synthesis of Pyrroles, 3<i>H</i>
-Pyrroles and Bicyclic Imidazolines by Ag- or P-Catalyzed [3+2] Cycloaddition of Allenoates with Activated Isocyanides
The divergent, stereoselective formal [3+2] cycloadditions of allenoates with activated isocyanides catalyzed by silver or phosphine‐based catalysts were investigated. Silver catalysis is capable of delivering a range of 3H‐pyrroles in high stereoselectivities. These enantioenriched heterocycles can either undergo sequential cyclisation with isocyanoacetates to deliver unprecedented bicyclic imidazolines
Hypervalent iodine oxidation of 5-substituted and 5-methyl-4-substituted pyrazol-3(2H)-ones. A facile synthesis of 2-alkynoic and 2,3-allenic esters
作者:Robert M. Moriarty、Radhe K. Vaid、Payman Farid
DOI:10.1039/c39870000711
日期:——
Phl(OAc)2–MeOH causes oxidation of 5-substitutedpyrazol-3(2H)-ones to the 2-alkynoic methyl ester and 5-methyl-4-substitutedpyrazol-3(2H)-ones to the 2,3-allenic methyl ester.
Lead(IV) Acetate Oxidations of 3-Substituted and 3,4-Disubstituted 2-Pyrazoline-5-ones: A Facile Synthesis of 2-Alkynoic and 2,3-Alkadienoic (Allenic) Esters
作者:B. Myrboh、H. Ila、H. Junjappa
DOI:10.1055/s-1982-30090
日期:——
Thallium in Organic Synthesis. XXXVI.New synthesis of allenic esters
作者:Edward C. Taylor、Roger L. Robey、Alexander McKillop
DOI:10.1021/jo00982a052
日期:1972.8
MORIARTY, R. M.;VAID, R. K.;RAVIKUMAR, V. T.;HOPKINS, T. E.;FARID, P., TETRAHEDRON, 45,(1989) N, C. 1605-1610
作者:MORIARTY, R. M.、VAID, R. K.、RAVIKUMAR, V. T.、HOPKINS, T. E.、FARID, P.