Pd-Catalyzed Carbonylation of Diazo Compounds at Atmospheric Pressure: A Catalytic Approach to Ketenes
作者:Zhenhua Zhang、Yiyang Liu、Lin Ling、Yuxue Li、Yian Dong、Mingxing Gong、Xiaokun Zhao、Yan Zhang、Jianbo Wang
DOI:10.1021/ja107351d
日期:2011.3.30
and affects the diastereoselectivity of the β-lactam products by assisting isomerization of the addition intermediate. On the other hand, the acylketenes generatedfrom the Pd-catalyzed carbonylation of α-diazoketones react with imines in a formal [4 + 2] cycloaddition manner to afford 1,3-dioxin-4-one derivatives. This straightforward carbonylation provides a new approach toward highly efficient catalytic
One-pot synthesis of <i>trans</i>-<font>β</font>-lactams from ferrocenylketene generated by thermal Wolff rearrangement
作者:Mingshun Liu、Jian’an Wang、Xiaoxi Yuan、Rong Jiang、Nanyan Fu
DOI:10.1080/00397911.2017.1378358
日期:2017.12.17
ABSTRACT A series of β-lactams containing the ferrocene moiety were synthesized through the Staudinger reaction between ferrocenylketene generated by the thermal Wolff rearrangement of the corresponding diazo ketone and various imines. The stereochemical outcome has been investigated and the trans-products were isolated as the main products, opposite to the reported results by Bonini and coworkers
摘要 通过相应重氮酮的热沃尔夫重排产生的二茂铁基烯酮与各种亚胺之间的施陶丁格反应合成了一系列含有二茂铁部分的β-内酰胺。立体化学结果已被研究,反式产物作为主要产物被分离出来,这与 Bonini 和同事报告的结果相反。(±)-trans-1,4-diphenyl-3-ferrocenylazetidin-2-one (3c) 的绝对构型通过 X 射线分析确定。从反应机理的角度讨论立体选择性。图形概要
Trisoxazoline/Cu(II)-Promoted Kinugasa Reaction. Enantioselective Synthesis of <i>β</i>-Lactams
作者:Meng-Chun Ye、Jian Zhou、Yong Tang
DOI:10.1021/jo0602874
日期:2006.4.1
precursor for the first time in the Kinugasareaction, and this allowed the reaction to be performed under a practical and convenient condition. An appropriate base used in this reaction was essential to control both diastereoselectivity and enantioselectivity. Compared with primary and tertiary amines, secondary amines gave higher enantioselectivities. The reaction scope and limitation as well as the