[3,3]-Sigmatropic Rearrangement of Boronated Allylcyanates: A New Route to α-Aminoboronate Derivatives and Trisubstituted Tetrahydrofurans
作者:Sabrina Touchet、Aurélie Macé、Thierry Roisnel、François Carreaux、Alexandre Bouillon、Bertrand Carboni
DOI:10.1021/ol401016x
日期:2013.6.7
[3,3]-Sigmatropic cyanate–isocyanate rearrangement provides a powerful tool for the preparation of α-isocyanato allylboronic esters, which can be further trapped with a variety of nucleophiles. Hydrogenation gave the corresponding α-aminoboronates derivatives while addition of aldehydes afforded homoallylic alcohols, (tetrahydrofuran-2-yl)carbamate, ether, or urea derivatives.
[3,3]-适性氰酸酯-异氰酸酯重排为制备α-异氰酸根合烯丙基硼酸酯提供了强大的工具,该酯可进一步被多种亲核试剂所俘获。氢化得到相应的α-氨基硼酸酯衍生物,同时加入醛得到均烯丙基醇,(四氢呋喃-2-基)氨基甲酸酯,醚或脲衍生物。