作者:Matthias N. Wrobel、Paul Margaretha
DOI:10.1002/hlca.200390051
日期:2003.2
On irradiation (254 nm), the newly synthesized Boc-protected 5-alkenyl-2,5-dihydro-1H-pyrrol-2-ones 13 undergo regioselective intramolecular [2+2] photocycloadditions. While the allyl derivatives 13a–13c afford mainly azatricyclo[3.3.0.02,7]octanones, i.e., crossed cycloadducts, the butenyl- and pentenyl-substituted compounds 13d and 13e isomerize preferentially to straight cycloadducts.
在辐射(254 nm)下,新合成的Boc保护的5-链烯基-2,5-二氢-1 H-吡咯-2-酮13经历了区域选择性的分子内[2 + 2]光环加成反应。尽管烯丙基衍生物13a - 13c主要提供氮杂三环[3.3.0.0 2,7 ]辛酮,即交叉的环加合物,但丁烯基和戊烯基取代的化合物13d和13e优先异构化为直环加合物。