1,4-addition of lithiated derivatives from 1,3-dithianes to α-unsaturated aldehydes : A way to δ-carbonyl aldehydes
作者:Mahmoud El-Bouz、Lya Wartski
DOI:10.1016/s0040-4039(00)78638-2
日期:1980.1
1,4-Addition of the lithiated derivatives of the 1,3-dithiane and 2-phenyl-1,3-dithiane on α-unsaturated aldehydes is performed in THF-HMPA ; this reaction could be an interesting way to δ-carbonyl aldehydes.
Catalytic Conjugate Addition of Acyl Anion Equivalents Promoted by Fluorodesilylation
作者:Scott E. Denmark、Lindsey R. Cullen
DOI:10.1021/ol403041k
日期:2014.1.3
The conjugate addition of acylanionequivalents derived from 2-silyl-1,3-dithianes to α,β-unsaturated ketones and esters has been achieved using a substoichiometric amount of TBAF. High yields and short reaction times are observed for the addition of aryl-1,3-dithianes to a variety of cyclic and acyclic α,β-unsaturated carbonyl acceptors. Observation of the reactive anion by 13C NMR spectroscopy and
已经使用亚化学计量的TBAF实现了将2-甲硅烷基-1,3-二硫杂环丁烷衍生的酰基阴离子当量共轭添加到α,β-不饱和酮和酯中。对于将芳基-1,3-二硫杂环丁烷加成到各种环状和无环α,β-不饱和羰基受体上,观察到高产率和短反应时间。还显示了通过13 C NMR光谱观察反应性阴离子并扩展至不对称变体。
Addition conjuguee de derives lithies de dithianne-1,3 aux aldehydes αβ ethyleniques
作者:L. Wartski、M. El Bouz
DOI:10.1016/0040-4020(82)80108-7
日期:1982.1
In order to synthesize γ carbonyl aldehydes which are interesting precursors in organic synthesis, we examine the action of masked acylanions, the lithiated derivatives from 1,3 dithiane 1a and 2-phenyl-1,3- dithiane on selected unsaturated aldehydes: crotonaldehyde 2, cinnamaldehyde 3 3-methyl butenal 4 and methacrolein 5. In THF 1a leads with the four aldehydes to allylic alcohols. However 1b gives