Synthesis and Fugicidal Activities of 2-Silatranyl Propylamino-4-substitued Phenyl(Hydrogen)-5,5-dimethyl-1,3,2-dioxaphosphinanes-2-oxides (Sulfides)
摘要:
Phosphoryl-aminopropyl-silatranes 4 were synthesized by nucleophilic reactions of 2-Cl-1,3,2- dioxaphosphinanes 2 with gamma-aminopropyl-silatrane 3, which was obtained by the cyclization reaction of triethanolamine and gamma-aminopropyltriethoxysilane. The structures of the products were characterized by H-1 NMR, P-31 NMR, IR, MS, and elemental analyses. The target compounds 4 exhibited fungicidal activity.
In an attempt to find novel plant growth regulators, a series of unsaturatedcyclic α-hydroxyphosphonates were synthesized by the addition reactions of 4-aryl-5,5-dimethyl-1,3,2-dioxaphosphinane 2-oxides with 5-aryl-2E,4E-pentadienaldehydes. The cis and trans isomers of the products were isolated. The structures of all products were confirmed by elemental analyses and by NMR and IR spectroscopy or
Crossed aldolreactionbetween aromatic aldehydes having an electron-withdrawing group and trimethylsilylenolates generated from several aldehydes proceeded smoothly in dry or water-containing DMF...
Phase-Transfer Synthesis of Optically Pure Oxetanes Obtained from 1,2,2-Trisubstituted 1,3-Propanediols
作者:Hu Xianming、Richard M. Kellogg
DOI:10.1055/s-1995-3939
日期:1995.5
Treatment of the 3-monomethanesulfonates of 1,2,2-trisubstituted 1,3-propanediols under phase-transfer conditions affords 2-aryl (or alkyl)-3,3-dialkyloxetanes. Twelve oxetanes have been obtained by this method; three of these oxetanes have been obtained enantiomerically pure as both enantiomers starting from the appropriate enantiomerically pure 1,3-diols. In these reactions the chiral center does not undergo inversion and the oxetanes have the same absolute configuration as the starting 1,3-diols.
A Novel Synthesis of 2,5-Disubstituted 1,3,4-Oxadiazolines by the Regioselective Cyclization of 1,4-Disubstituted Thiosemicarbazides
作者:You Huang、Ruyu Chen、Dexin Feng、Yaqin Yu、Haibin Song
DOI:10.1055/s-2007-983714
日期:2007.6
A novel and efficient route for the regioselective synthesis of 5-aryl-2-[(4-aryl-2-oxo-1,3,2-dioxaphosphinan-2-yl)imino]-2,3-dihydro-1,3,4-oxadiazoles in high yield and purity by the desulfurization and cyclization of 1-benzoyl-4-[(4-aryl-2-oxo-1,3,2-dioxaphosphinan-2-yl)thiosemicarbazides under mild conditions is reported. The products are isolated as the trans-isomer only.