Molecular Recognition of α,β-Unsaturated Carbonyl Compounds Using Aluminum Tris(2,6-diphenylphenoxide) (ATPH): Structural and Conformational Analysis of ATPH Complexes and Application to the Selective Vinylogous Aldol Reaction
Various alpha,beta-unsaturated carbonyl compounds were coordinated with aluminumtris(2,6-diphenylphenoxide) (ATPH) to give the corresponding Lewis acid-base complexes in a distinctive coordination fashion (selective coordination). ATPH recognizes carbonyl substrates and subsequently orients itself as it forms a stable complex through selective coordination with the carbonyl oxygen. Selective coordination
Simple Synthesis of Conjugated
All-(<i>E</i>)-Polyenic Aldehydes, Ketones,
and Esters Using Chemoselective Cross-Metathesis and an Iterative
Sequence of Reactions: Application to the Synthesis of Navenone
B
作者:Samir BouzBouz、Janine Cossy、Christophe Roche
DOI:10.1055/s-0028-1087953
日期:——
By using a very simple sequence of reactions such as allylation, acetylation, chemoselective cross-metathesis, and elimination, even and odd conjugated all-(E)-polyenes can be synthesized from very simple alkenes.
Exclusive γ-regio functionalization of crotonaldehyde using γ-trimethylsilyl crotonaldimine. Application to the one pot synthesis of conjugated dienals
作者:Moncef Bellassoued、Malika Salemkour
DOI:10.1016/0040-4020(96)00165-2
日期:1996.3
Cesium fluoride mediated reaction of γ-trimethylsilyl N-tert-butyl crotonaldimine 9 with a wide range of aldehydes takes place in DMSO at room temperature and affords exclusiveγ-regiofunctionalized products. Heating (rt to 100°C) the δ-silyloxy imines 11 thus obtained leads, after very mild hydrolysis of the tert-butylimine function, to the conjugateddienals 14 in good yields and with excellent
Highly stereoselective synthesis of C-(alkynyl)-pseudoglycals from δ-hydroxy-α,β-unsaturated aldehydes
作者:J.S. Yadav、A. Krishnam Raju、V. Sunitha
DOI:10.1016/j.tetlet.2006.05.159
日期:2006.7
An efficient and novel methodology for the synthesis of C-(alkynyl)-pseudoglycals from delta-hydroxy-alpha,beta-unsaturated aldehydes has been developed. (c) 2006 Elsevier Ltd. All rights reserved.