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.
作者:Paul Armstrong、Ronald Grigg、Frances Heaney、Sivagnanasundram Surendrakumar、William J Warnock
DOI:10.1016/s0040-4020(01)87117-9
日期:1991.1
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-
C-3,-4,-5和-6-烯基肟通过迈克尔加成法或烯型方法与氮原子上的负电性烯烃反应,生成相应的C-烯基硝酮,并进行分子内环加成。环加成可以通过两种方式之一发生,从而导致桥联或稠合的异恶唑烷。在大多数情况下,后者是优选的,除了仅产生桥环产物的C-(3-烯基)硝酮和衍生自N-烯丙基吡咯-2-羧醛肟的C-(4-烯基)硝酮外。桥环和稠环异恶唑烷。