Enantioselective Radical Methods for Lactone Synthesis: Use of Unprotected Haloalcohols as Radical Precursors
作者:Mukund P. Sibi、Miguel A. Guerrero
DOI:10.1055/s-2005-865319
日期:——
We have developed an efficient free radical method for the synthesis of enantioenriched 6- and 7-membered lactones in one synthetic operation.
我们开发了一种高效的自由基方法,可在一次合成操作中合成对映体丰富的 6 元和 7 元内酯。
DBU-catalyzed Michael additions of bulky glycine imine to β-arylfuryl substituted α,β-unsaturated esters
作者:Mei-Ling Cheng、Xue-Ying Wang、Yu-Jun Bai、Si-Kai Zhu、Sheng-Yong Zhang、Guo-Qiang Bao、Ping-An Wang
DOI:10.1080/00397911.2023.2240450
日期:2023.10.2
Abstract DBU-catalyzed Michael reactions between tert-butyl 2-((diphenylmethylene) amino)acetate and simple β-substituted α,β-unsaturated esters have been achieved in high yields (up to 95% yield) and diastereoselectivties (up to 99:1 dr) in the presence of 1.0 eq. of LiBr in acetonitrile under room temperature. The Michael adduct can be easily converted into trans-3-substituted pyroglutamic acid ester