1,3-Dioxa-[3,3]-sigmatropic Oxo-Rearrangement of Substituted Allylic Carbamates: Scope and Mechanistic Studies
作者:Maddalen Agirre、Sylvain Henrion、Ivan Rivilla、José I. Miranda、Fernando P. Cossío、Bertrand Carboni、José M. Villalgordo、François Carreaux
DOI:10.1021/acs.joc.8b01320
日期:2018.12.21
alkenyl-substituted allylic alcohols with activated isocyanates is reported. The reorganization of bonds is highly dependent on the electron density of the aromatic ring and the nature of isocyanate used. This metal-free tandem reaction from branched allyl alcohols initiated by a carbamoylation reaction and followed by a sigmatropic rearrangement thus offers a new access to (E)-cinnamyl and conjugated (E,E)-diene
据报道,在用活化的异氰酸酯处理芳基和烯基取代的烯丙基醇的过程中,发生了意外的1,3-二氧杂-[3,3]-σ重排。键的重组高度取决于芳环的电子密度和所用异氰酸酯的性质。由氨基甲酸酯化反应引发的支链烯丙醇的无金属串联反应,然后发生σ重排,因此提供了新的途径获得(E)-肉桂基和共轭(E,E)-二烯氨基甲酸酯,例如N-酰基和N -磺酰基衍生物。为了使这种现象合理化,进行了计算研究,并且进行了重排进行动力学分析。