Asymmetric Synthesis of Less Accessible α-Tertiary Amines from Alkynyl <i>Z-</i>
Ketimines
作者:Taichi Kano、Yusuke Aota、Keiji Maruoka
DOI:10.1002/anie.201710084
日期:2017.12.18
highly stereoselective synthesis of hitherto less accessible chiral α‐tertiary amines with multiple structurally similar linear carbon chains was achieved through chiral auxiliary mediated addition of organolithium reagents to the geometrically well‐controlled alkynyl Z‐ketimines. This stereoselective nucleophilic addition offers a general approach to the asymmetric synthesis of nitrogen‐containing
Michael Addition-Lactonization Reaction of Electron-Deficient Alkynes with N-(Diphenylmethylene)glycinates: An Efficient Synthesis of 3-Amino-2-pyrone Derivatives
作者:Tao Lu、Qing-Fa Zhou、Yong Zhu、Wei-Fang Tang
DOI:10.1055/s-0029-1217098
日期:2010.1
approach is based on the Michael addition of N-(diphenylmethylene)glycinates to various alkynyl ketones, followed by lactonization using 10 mol% sodium hydroxide as catalyst. Aromatic and aliphatic alkynyl ketones were converted into the corresponding 3-amino-2-pyrone derivatives in moderate to high yields. When methyl propiolate was submitted to the reaction, α,β-dehydroamino acids were formed in good
The condensation of substituted α-keto alkynes with p-nitrobenzaldehyde in the presence of lithiumdiisopropylamide (LDA) affords highly substituted 5,6-dihydro-4H-oxocin-4-ones in good yields. Surprisingly, no six-membered carbocycles were formed in this 8-endo-dig cyclization to the oxocinone system.
NOVEL DEORDORISING COMPOSITIONS AND DEODORISING PRODUCTS CONTAINING SAME
申请人:Casazza André
公开号:US20120201778A1
公开(公告)日:2012-08-09
The invention relates to novel deodorant compositions containing at least one compound of the family of acetylenic ketones and the deodorant products containing them. A particularly preferred composition according to the invention comprises at least one compound of the family of the α-acetylenic ketones and a mixture of aldehydes chosen from two different families.