作者:Daniel P. Canterbury、Alison J. Frontier、Joann M. Um、Paul H.-Y. Cheong、Dahlia A. Goldfeld、Richard A. Huhn、K. N. Houk
DOI:10.1021/ol8019154
日期:2008.10.16
alkynes is described. The three-step sequence involves the 1,3-dipolar cycloaddition of a nitrone and an alkynoate, oxidation of the resulting isoxazoline, and stereoselective extrusion of nitrosomethane. Quantum mechanical calculations identified the interactions of R3 with the oxidant and the preferred conformation of a diradical intermediate as major factors controlling the stereoselectivity of the
描述了一种温和、方便的炔烃氧化烷基化反应。该三步序列包括硝酮和炔酸酯的 1,3-偶极环加成、所得异恶唑啉的氧化以及亚硝基甲烷的立体选择性挤出。量子力学计算确定了 R3 与氧化剂的相互作用以及双自由基中间体的优选构象是控制氧化的立体选择性和挤出的扭矩选择性的主要因素。