Stereocontrolled [4+1] Annulation of α-Hydroxycyclobutenones: Synthesis of Polysubstituted Cyclopentenones
作者:Xu Mao、Peidong Song、Yu Hao、Zezhong Sun、Xiangdong Hu
DOI:10.1002/adsc.201600670
日期:2016.12.7
A stereocontrolled [4+1] annulation of α‐hydroxycyclobutenones has been disclosed. For the first time, α‐hydroxycyclobutenones have been proven as facile diene precursors for [4+1] annulation. Meanwhile, the reported transformation presents a concise synthetic route to polysubstituted cyclopentenones with high stereoselectivity.
A general, regiospecific synthesis of highly substituted quinones
作者:Lanny S. Liebeskind、Suresh Iyer、Charles F. Jewell
DOI:10.1021/jo00365a043
日期:1986.7
Synthesis of p-chlorophenols (and -naphthols) from the thermal rearrangement of 4-chlorocyclobutenones
作者:Simon L. Xu、Harold W. Moore
DOI:10.1021/jo00027a057
日期:1992.1
A systematic study of the reaction of 4-hydroxycyclobutenones with thionyl chloride is reported. A useful model evolves from this study which allows the prediction of the site of chlorination for unsymmetrical examples. The chlorination is envisaged to involve the corresponding homoaromatic carbocation, and the site of chlorination takes place preferentially at the position substituted with the greater cation-stabilizing substituent. Specifically, this follows the general order of allyl > benzyl > alkyl > propargyl. The 4-chlorocyclobutenones prepared in this study were shown to be useful synthetic precursors to highly substituted chlorophenols and chloronaphthols.
LIEBESKIND L. S.; IYER SURESH; JEWELL CH. F., J. ORG. CHEM., 51,(1986) N 15, 3065-3067