A formal [3+3] cycloaddition strategy to substituted glutarimides was studied. N-Benzyl α-sulfonylacetamides and various α,β-unsaturated esters were used as starting materials.
We describe an efficient route towards the synthesis of fusedbicyclic glutarimides using facile [3+3] reaction of α-sulfonylacetamides with different α,β-unsaturated esters as the key step. Intramolecular cyclization of 4-substituted 3-sulfonylglutarimide to form 5,6-, 6,6- or 6,7-fused bicyclic glutarimides was accomplished via alkylation, oxidative cyclization or ring-closing metathesis in modest
Regioselective Reduction of N-Alkyl-3-sulfonyl Glutarimide. Formal Synthesis of 1,2,3,4,6,7,12,12b-Octahydroindolo[2,3-a]quinolizine and Homobaclofen
作者:Shui-Tein Chen、Meng-Yang Chang
DOI:10.3987/com-02-9626
日期:——
hydroxypiperidinones which werefurther dehydrated to two pyridin-2-ones in the presence of boron trifluoride etherate. Cycloaddition and regioselective reduction were combined to synthesize 1,2,3,4,6,7,12,12b-octahydroindolo[2,3-a]quinolizine and homobaclofen.
1,8-Diazabicyclo[5.4.0]undec-7-ene: A Remarkable Base in the Debromination of 4- or 5-Substituted<i>N</i>-Benzyl α-Bromo-α-<i>p</i>-Toluenesulfonylglutarimide
115, Tai wan, R.O.C. b De part ment of Chem is try, Na tional Sun Yat-Sen Uni ver sity, Kaohsiung 804, Tai wan, R.O.C. Debromination of N-benzyl 4- or 5-substituted -bromo- -p-toluenesulfonylglutarimides is achieved with 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) to give the N-benzyl 4- or 5-substituted -p-toluene sul fonyl glutarimides. The DBU/THF sys tem is ap plied to a new meth od ol ogy for the syn
b( ) a 生物化学研究所,中华民国台湾省南康市南康市中央研究院 b 国立中山大学化学系sity, Kaohsiung 804, Taiwan, ROC 用 1,8-二氮杂双环[5.4.0]undec-7-ene (DBU) 将 N-苄基 4-或 5-取代的-溴--对甲苯磺酰基戊二酰亚胺脱溴得到N-苄基4-或5-取代-对甲苯磺酰戊二酰亚胺。将 DBU/THF 系统应用于以中等收率合成双环戊二酰亚胺骨架的新方法。
A Facile Route to Polysubstituted<i> N</i>-Benzyl Pyroglutamates
作者:Pei-Pei Sun、Meng-Yang Chang、Michael Y. Chiang、Nein-Chen Chang
DOI:10.1021/ol0344164
日期:2003.5.1
[reaction: see text] Base-induced coupling/cyclizationreactions of alpha-sulfonylacetamide with various ethyl (Z)-2-bromo-2-propenoates have been carried out. The polysubstituted pyroglutamate carbon skeleton, with three contiguous asymmetric centers, was built up in one step. A ring-closure mechanism is proposed for the reactions.