The I2-induced cyclisation of 2-alkenyl-1,3-dicarbonyl compounds with the mono- and di-substituted double bond occurred with good diastereoselectivity. A study of stereochemical aspects for different substituents on the allyl side chain was carried out. When the substituents were alkyl groups, the trans isomers formed preferentially, in the case of aromatic substituents the reaction lead instead to
I 2诱导的具有单和双取代双键的2-烯基-1,3-二羰基化合物的环化反应具有良好的非对映选择性。对烯丙基侧链上不同取代基的立体化学方面进行了研究。当取代基为烷基时,反式异构体优先形成,在芳族取代基的情况下,反应代替顺式异构体。