Organotin chemistry. Part XI. The preparation of organotin alkoxides
作者:Alwyn G. Davies、D. C. Kleinschmidt、P. R. Palan、S. C. Vasishtha
DOI:10.1039/j39710003972
日期:——
Trialkyltin alkoxides, R3SnOR′, can be prepared conveniently by thermal decarboxylation of a mixture of the oxide, (R3Sn)2O, and dialkyl carbonate, (R′O)2CO, or (except when R = Me or Et) by azeotropic dehydration of a mixture of the bistrialkyltin oxide and alcohol, R′OH. Under these latter conditions, dibutyltin oxide forms the 1,1,3,3-tetra-butyl-1,3-dialkoxydistannoxanes, (R′O)Bu2Sn·O·SnBu2(OR′)
Stannyl ceramides as efficient acceptors for synthesising β-galactosyl ceramides
作者:José Antonio Morales-Serna、Yolanda Díaz、M. Isabel Matheu、Sergio Castillón
DOI:10.1039/b809570a
日期:——
β-Galactosyl ceramides have been obtained in excellent yields and stereoselectivities by reacting disarmed glycosyl donors with stannyl ethers. The broad compatibility of stannyl ethers with various leaving groupâpromoter pairs is demonstrated.
An approach to α,α-disubstituted α-amino acids is reported. The key step is allyl cyanate-to-isocyanate rearrangement. As demonstrated, the resultant allyl isocyanates can be directly trapped with various nucleophiles, for instance, alcohols, amines, and organometallic reagents, to provide a broad range of N-functionalized allylamines. The developed method has been successfully applied in the synthesis
Reaction of phenyl benzoate with tri-n-butyltinhydride has been found to give mainly toluene, benzyl benzoate, tri-n-butyltin phenoxide and tri-n-butyltin benzoate. Possible reaction paths leading to these products are discussed. A SH2 mechanism involving initial attack of tri-n-butyltin radical at the ethereal oxygen atom of the ester with displacement of the benzoyl moiety appears to be consistent
已发现苯甲酸苯酯与氢化三正丁基锡的反应主要产生甲苯,苯甲酸苄酯,苯酚三正丁基锡和苯甲酸三正丁基锡。讨论了导致这些产物的可能的反应路径。AS H 2机理涉及三正丁基锡自由基在酯的醚氧原子上的初始进攻以及苯甲酰基部分的置换,这似乎与观察到的实验证据是一致的。
Synthesis of alkoxystannanes by reactions of O-(organylstannyl) carbamates with alcohols
作者:N. V. Komarov、N. A. Ryzhkova、A. A. Andreev
DOI:10.1023/b:rucb.0000037867.28725.b6
日期:2004.4
Reactions of O-(organylstannyl) carbamates with alcohols afford alkoxystannanes and proceed most completely on heating in an excess of alcohol. The reactions provide a new approach to the synthesis of difficultly accessible alkoxystannanes.