Highly Regio- and Stereoselective Iodohydroxylation of Non- Heteroatom-Substituted Allenes: An Efficient Synthesis of 4-[3′-Hydroxy-2′-iodoalk-1′(Z)-enyl]-2(5H)-furanone Derivatives
作者:Zhenhua Gu、Youqian Deng、Wei Shu、Shengming Ma
DOI:10.1002/adsc.200700181
日期:2007.7.2
An efficient protocol for the highlyregio- and stereoselectivesynthesis of 4-(3′-hydroxy-2′-iodoalk-1′(Z)-enyl)furan-2(5H)-one derivatives via selective iodohydroxylation of non-heteroatom-substituted allenes, i.e., 4-allenyl-2(5H)furanones, has been developed. The regio- and stereoselectivity of this reaction may be controlled by the electronic and steric effects of the furanone ring.
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