A number of acetals, aminoacetals, carboxamideacetals, and aromatic esters were synthesized and evaluated for topicalrepellency on human skin against Aedes aegypti mosquitoes. The aminoacetals exhibited the highest degrees of repellency, but none of the compounds rivaled N,N‐diethyl‐m‐toluamide in terms of duration of protection. Repellency was related to volatility, and it is concluded that useful
Direct addition of a chiral N-azidoacetyl thiazolidinethione to a variety of dialkyl acetals catalyzed by a commercially available and structurally simple nickel(II) complex gives access in good yields and a highly stereocontrolled manner to anti-β-alkoxy-α-azido carboxylic derivatives which, in turn, can be easily converted into a wide array of enantiomericallypure compounds.
Direct <i>anti</i>
Glycolate Aldol Reaction of Protected Chiral <i>N</i>
-Hydroxyacetyl Thiazolidinethiones with Acetals Catalyzed by a Nickel(II) Complex
作者:Juan Manuel Romo、Pedro Romea、Fèlix Urpí
DOI:10.1002/ejoc.201901097
日期:2019.9.30
Tiny amounts of commercially available and easy to handle (Me3P)2NiCl2 trigger the stereoselective aldol addition of chiral N‐2‐pivaloyloxyacetyl thiazolidinethione 7 to acetals to provide the corresponding anti glycolate adducts in a highly efficient manner.
Protected <i>syn</i>-Aldol Compounds from Direct, Catalytic, and Enantioselective Reactions of <i>N</i>-Acyl-1,3-oxazinane-2-thiones with Aromatic Acetals
作者:Miguel Mellado-Hidalgo、Elias A. Romero-Cavagnaro、Sajanthanaa Nageswaran、Sabrina Puddu、Stuart C. D. Kennington、Anna M. Costa、Pedro Romea、Fèlix Urpí、Gabriel Aullón、Mercè Font-Bardia
DOI:10.1021/acs.orglett.2c04254
日期:2023.2.3
A direct and asymmetric syn-aldol reaction of N-acyl-1,3-oxazinane-2-thiones with dialkyl acetals from aromatic acetals in the presence of 2–5 mol % [DTBM-SEGPHOS]NiCl2, TMSOTf, and lutidine has been developed. It has been established that the oxazinanethione heterocycle, used for the first time as a scaffold in asymmetric carbon–carbon bond-forming reactions, can be smoothly removed to give access
在 2–5 mol % [DTBM-SEGPHOS]NiCl 2、TMSOTf 和二甲基吡啶存在下, N -acyl-1,3-oxazinane-2-thiones 与来自芳香族缩醛的二烷基缩醛的直接和不对称顺式-aldol反应具有被开发。已经确定,首次用作不对称碳-碳键形成反应支架的恶嗪硫酮杂环可以顺利去除,从而获得各种具有高合成价值的对映体纯化合物。
Verfahren zur katalytischen Hydrogenolyse von p-substituierten Benzaldehyd-dimethylacetalen zu den entsprechenden Benzylmethyl-ether-Derivaten