A general and stereoselective method for synthesis of tri- and tetrasubstituted alkenes
作者:I Maciągiewicz、P Dybowski、A Skowrońska
DOI:10.1016/s0040-4020(03)00977-3
日期:2003.8
A convenient, general and stereoselectivesynthesis of trisubstituted alkenes and tetrasubstituted alkenes containing a cyanide function as well as trisubstituted episulphides have been elaborated. Methodology described for the preparation of these compounds is based on the corresponding readily available selenophosphates 1 and thiophosphates 2.
Trifluoroaceticanhydride reacts with organophosphorus compounds containing thiophosphoryl and selenophosphoryl groups converting them in high yield to the corresponding oxygenated systems.
三氟乙酸酐与含有硫代磷酰基和硒代磷酰基的有机磷化合物反应,将它们高产率地转化为相应的氧化体系。
Ambidentate nucleophiles. Part 3. Reactions of phosphoroselenoates with molecular halides: the use of 1 J(PSe) as a structural diagnostic
作者:Christopher Glidewell、Elaine J. Leslie
DOI:10.1039/dt9770000527
日期:——
Sodium OO′-di-isopropyl phosphoroselenoate, Na[SeOP(OPri)2](Na[L]), reacts with molecular halides of carbon, silicon, germanium, tin, phosphorus, arsenic, and sulphur to give derivatives MLn. Comparison of the values of 1J(PSe) in the products with those in a number ofmodel compounds indicates that O-bonded isomers M[OP(OPri)2Se] are formed in LCOPh and PL3, that Se-bonded isomers M[SePO(OPri)2] are
Iodosobenzene and Iodoxybenzene as Reagents for Oxygen Transfer in Organophosphorus Chemistry
作者:Grażyna Mielniczak、Andrzej Łopusiński
DOI:10.1055/s-2001-12312
日期:——
The application of iodosobenzene (1) and iodoxybenzene (2) for the oxidation reaction of phosphorus, phosphorothiono and phosphoroseleno compounds into the corresponding ≡P(O) analogs is demonstrated. Retention of configuration at the phosphorus atom and full stereoselectivity of these reactions in model diastereoisomeric cis- and trans-2-phenylamino-2-thiono-4-methyl-1.3.2-dioxaphosphorinans (30) as well cis- and trans-2-phenylamino-2-seleno-4-methyl-1.3.2-dioxaphosphorinans (31) systems, are demonstrated.
A general synthesis of a new class of compounds Se-(β-oxoalkyl) O,O-dialkyl selenophosphates based on selenophosphorylation of silyl enol ethers with the chloroselenotrialkoxyphosphonium chlorosulfide 3 is described.