Sequential Rearrangement of 1,2,4<i>Z</i>,7-Tetraenes Involving [1,5]-Hydrogen Migration and Electrocyclization: An Efficient Synthesis of Eight-Membered Cyclic Compounds
作者:Shengming Ma、Zhenhua Gu
DOI:10.1021/ja057985a
日期:2006.4.1
established. The possible intermediate for this transformation was trapped by its Diels-Alder reaction with N-ethyl maleimide. Thus the reaction may proceed via the sequential processes involving [1,5]-hydrogen migration and electrocyclization.
Studies on Thermal Reactivity of β-(1,2-Allenyl)butenolides and 2-Allyl-3-allenylcyclohex-2-enones
作者:Zhenhua Gu、Shengming Ma
DOI:10.1002/chem.200701171
日期:2008.3.7
A series of thermal pericyclic reactions of beta-allenylfuranones have been studied. It was observed that beta-allenylfuranones would undergo 1,5-hydrogen shift to afford a new type of trienes upon heating. Due to their high reactivity, these trienes would undergo subsequent pericyclic reactions based on the nature of the substituent group R: When R is an alkyl group, the intermediate 4a or 4b would