Intramolecular cycloaddition reactions of oximes with vinyl sulfones
作者:Albert Padwa、Bryan H. Norman
DOI:10.1016/s0040-4039(00)87896-x
日期:1988.1
The reaction of oximes with vinylsulfones containing a π-bond produce cycloadducts which are derived from an intramolecular dipolar cycloaddition of a transient nitrone.
肟与含有π键的乙烯基砜反应生成环加合物,该环加合物衍生自瞬态腈的分子内偶极环加成。
X=Y-ZH systems as potential 1,3-dipoles. Part 33. Generation of nitrones from oximes. Tandem Michael addition-1,3-dipolar cycloaddition reactions. Class 2 processes in which the dipolarophile is located within the oxime.
corresponding C-alkenyl nitrones which undergo an intramolecular cycloaddition. The cycloaddition can occur by one of two modes leading to either bridged- or fused-isoxazolidines. The latter is preferred in most cases except that of the C-(3-alkenyl) nitrone which gives exclusively the bridged-ring product and the C-(4-alkenyl)nitrones derived from N-allylpyrrole-2-carboxyaldehyde oxime which gives both bridged-