Pyrolysates obtained from the proto-photoadducts of methyl 2,4-dioxopentanoate with olefins were shown to be 3-acetyl-1,2-cyclopentanedione derivatives. One-pot formation of polyfunctionalized cyclopentane derivatives via a photocycloaddition has no precedence. Intentional preparation of the ring system was also achieved by a diethyl azodicarboxylate–triphenylphosphine treatment of the proto-adducts.
                                    从甲基2,4-二氧
戊酸酯与烯烃的原始光加合物中获得的热解产物被证明是3-乙酰基-
1,2-环戊二酮衍
生物。通过光环加成一锅合成多功能化的
环戊烷衍
生物尚无先例。通过
二乙基偶氮二羧酸酯–
三苯基膦处理原加合物,也成功实现了环系的 intentional 准备。