Allylation of Nitrosobenzene with Pinacol Allylboronates. A Regioselective Complement to Peroxide Oxidation
作者:Robert E. Kyne、Michael C. Ryan、Laura T. Kliman、James P. Morken
DOI:10.1021/ol101472k
日期:2010.9.3
Addition of nitrosobenzene to pinacol allylboronates leads to oxidation of the organoboron with concomitant rearrangement of the substrate alkene. This reaction appears to proceed by allylboration of the nitroso group in analogy to carbonyl and imine allylation reactions. Remarkably, the N−O bond is cleaved during the reaction such that simple alcohols are the final reaction product.
Ni(0)-Catalyzed 1,4-Selective Diboration of Conjugated Dienes
作者:Robert J. Ely、James P. Morken
DOI:10.1021/ol101797f
日期:2010.10.1
stereoselective 1,4-diboration of conjugated dienes with B2(pin)2 was accomplished with Ni(cod)2 and PCy3 as the catalyst. This reaction broadens the substrate scope of current methods for catalytic diene diboration by including internal and sterically hindered dienes, and it proceeds efficiently at low catalyst loadings. The intermediate allylboronate was oxidized to the stereodefined allylic 1,4-diol.
Ely, R. J.; Morken, J. P., Journal of the American Chemical Society, 2010, vol. 132, p. 2534 - 2535
作者:Ely, R. J.、Morken, J. P.
DOI:——
日期:——
Stereoselective synthesis of terminal 1,3-butadienes by the condensation reaction of aldehydes and ketones with .gamma.-trimethylsilyl-substituted allylboranes
作者:Kung K. Wang、Chin Liu、Yu Gui Gu、Friedrich N. Burnett、Prem D. Sattsangi
DOI:10.1021/jo00005a045
日期:1991.3
Allylboranes 7-12, readily prepared from allenylsilanes 1-6 by hydroboration with 9-borabicyclo[3.3.1]nonane, smoothly condense with aldehydes and ketones to afford, after basic or acidic workup to promote the Peterson olefination reaction, a variety of terminal 1,3-butadienes. The dienes derived from aldehydes have high isomeric purity except in the cases with allylborane 12. Apparently, high diastereoselectivity was obtained during the condensation step with 7-11 to form 14. In each case, by simply changing the workup conditions to induce syn or anti elimination of hydroxytrimethylsilane, either the Z or the E isomer of the diene was obtained.
1,2-Elimination of alcohol from homoallyl ethers under the influence of mixed metal bases