The silyl-cupration and stannyl-cupration of allenes
作者:Ian Fleming、Michael Rowley、Purificacíon Cuadrado、Ana M. González-Nogal、Francisco J. Pulido
DOI:10.1016/0040-4020(89)80069-9
日期:1989.1
The stoichiometric silyl-cupration of allene 7, followed directly by treating the intermediate cuprate with a proton, with a range of carbon electrophiles, and with chlorine gives the vinylsilanes 8–13. Alternatively, when iodine is the electrophile, the product is the vinyl iodide 16. This can then be metallated and treated with a proton or a range of
Stereoselective Synthesis of (<i>Z</i>)- and (<i>E</i>)-Allylic Silanes by Copper-Mediated Substitution Reactions of Allylic Carbamates with Grignard Reagents
作者:Jacqueline H. Smitrovich、K. A. Woerpel
DOI:10.1021/jo991312r
日期:2000.3.1
Both (Z)- and (E)-allylic silanes were prepared with high stereoselectivity by the copper-mediated substitution of allylic carbamates by organometallic reagents. The reaction of alkylmagnesium reagents with (E)-allylic carbamates provides (Z)-allylic silanes, whereas both alkylmagnesium and alkyllithium reagents react with (Z)-allylic carbamates to afford (E)-allylic silanes. Because Grignard reagents
Stereochemistry in the hydroboration of allylsilanes
作者:Ian Fleming、Nicholas J Lawrence
DOI:10.1016/s0040-4039(00)87839-9
日期:——
The hydroboration of allylsilanes is highly stereoselective in the sense (3 → 4 and 6 → 7), especially with 9-BBN as the hydroborating reagent. The products can be converted stereospecifically into 1,3-diol derivatives (5 and 8).
Regiochemistry in the hydroboration of allylsilanes
作者:Ian Fleming、Nicholas J. Lawrence
DOI:10.1016/s0040-4039(00)87838-7
日期:——
The hydroboration of most types of allylsilane is highly selective for the formation of the product having the silicon and boron in a 1,3 relationship when the hydroboratingagent is 9-BBN. There is only a low degree of correlation between the difference in the chemical shifts of the trigonal carbon atoms on an alkene and the regioselectivity in hydroboration with either borane:THF or 9-BBN.