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。
Visible-Light-Induced Difluoropropargylation Reaction with Benzothiazoline as a Reductant
作者:Jingzhi Chen、Wenhao Huang、Ying Li、Xu Cheng
DOI:10.1002/adsc.201800066
日期:2018.4.3
techniques. Silyl‐protected bromodifluoropropyne is an important difluoropropargylation reagent with previously unexplored radical reactivity. Herein, we report visible‐light‐induced thiyl‐radical‐catalyzed hydrodifluoropropargylation reactions between silyl‐protected bromodifluoropropyne and alkenes in the presence of benzothiazoline as a critical reductant.
2-(Silylmethyl)cyclopentanones are prepared from 1,5-dienes, carbonmonoxide, and tris(trimethylsilyl)silane (TTMSS) under AIBN initiated freeradicalreaction conditions.
Diastereoselective Synthesis of Cyclopropanes from Carbon Pronucleophiles and Terminal Alkenes
作者:Min Ji Kim、Diana J. Wang、Karina Targos、Uriel A. Garcia、Alison F. Harris、Ilia A. Guzei、Zachary K Wickens
DOI:10.1002/anie.202303032
日期:——
A new protocol for diastereoselective cyclopropanation from unactivated alkenes and acidic carbon pronucleophiles is reported. The method is scalable and amenable to synthesis of medicinally relevant molecules.