Synergistic Relay Reactions To Achieve Redox‐Neutral α‐Alkylations of Olefinic Alcohols with Ruthenium(II) Catalysis
作者:Chen‐Chen Li、Jian Kan、Zihang Qiu、Jianbin Li、Leiyang Lv、Chao‐Jun Li
DOI:10.1002/anie.201915218
日期:2020.3.9
the first Grignard-type nucleophilic addition using olefinicalcohols as latent carbonyl groups, providing a higher yield of the corresponding secondary alcohol than the classical hydrazone addition to aldehydes does. A broad scope of unsaturated alcohols and hydrazones, including some complex structures, can be successfully employed in this reaction, which shows the versatility of this approach and
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。
Total Syntheses of Schulzeines B and C
作者:Mukund K. Gurjar、Chinmoy Pramanik、Debabrata Bhattasali、C. V. Ramana、Debendra K. Mohapatra
DOI:10.1021/jo070560h
日期:2007.8.1
Schulzeines B (2) and C (3) were synthesized by a convergent strategy using epimeric tricyclic lactam building blocks, 4 and 5, and the C28 fatty acid side chain 6. Syntheses of tricyclic lactams (4/5) were achieved by Bischler-Napieralski reaction. Sharpless asymmetric dihy-droxylation and BINAL-H-mediated asymmetric reduction of an enone was employed to prepare the key fatty acid side chain 6. The spectral as well as analytical data of 2 and 3 were in good agreement with the reported data for the natural products, thus confirming their assigned structures.