Mukaiyama–Michael addition of a ketenesilylacetal on a cyclic α,β-unsaturated ketone, followed by the addition of a glyoxylic, aromatic or heteroaromatic imine. According to the nature of the silyl group the adducts resulting from this tandem process are isolated as ketones or as enoxysilanes. The presence of a coordinating group on the imine increases the rate of the reaction.
Tandem Michael imino–aldol reactions catalyzed by samarium diiodide
作者:Nada Jaber、Jean-Claude Fiaud、Jacqueline Collin
DOI:10.1016/s0040-4039(01)01995-5
日期:2001.12
Samarium diiodide catalyzes a one-pot procedure allowing to perform sequentially the Michael addition of a ketenesilylacetal on a cyclic α,β-unsaturated ketone, followed by the addition of a glyoxylic or aromatic imine. The presence of a coordinating group on the imine increases the rate of the reaction.
Diastereoselective Synthesis of and Mechanistic Understanding for the Formation of 2‐Piperidinones from Imines and Cyano‐Substituted Anhydrides
作者:Michael J. Di Maso、Kevin M. Snyder、Fábio De Souza Fernandes、Ommidala Pattawong、Darlene Q. Tan、James C. Fettinger、Paul Ha‐Yeon Cheong、Jared T. Shaw
DOI:10.1002/chem.201504424
日期:2016.3.24
2‐Piperidinones are synthesized in a single step from imines and 2‐cyano glutaric anhydrides. The reaction provides the products in good diastereoselectivity and generates a quaternary stereogenic center. Substitutions on the anhydride skeleton are well tolerated to provide 2‐piperidinones with three stereogenic centers from a single transformation. The pertinent transition structures have also been
An Efficient and Diastereoselective Synthesis of <i>trans</i> β-Lactams and β-Aminocarbonyl Compounds
作者:Yan-Guang Wang、Shan-Zhong Jian、Cheng Ma
DOI:10.1055/s-2005-861803
日期:——
Efficient and diastereoselective syntheses of trans β-lactams and anti β-aminocarbonyl compounds from carboximide 1 and imines 2 under the classical Reformatsky reaction conditions are described. An enolate-imine mechanism has been proposed for this reaction.
β-Amino esters via the Reformatsky reaction: Restraining effects of the ortho-methoxyphenyl substituent
作者:James C. Adrian、Julia L. Barkin、Lamyaa Hassib
DOI:10.1016/s0040-4039(99)00248-8
日期:1999.3
β-Amino esters are, in most cases, the only products of the Reformatskyreaction in CH2Cl2 between (methoxycarbonyl)methyl zinc bromide (prepared in-situ) and imines prepared from either an aryl or alkyl aldehyde and o-anisdine (Scheme 2). Restraining properties of the ortho-methoxyphenyl group, which lead to sole formation of the β-amino ester, are ascribed to the inductive effect of the ortho-methoxy