Tandem Diels–Alder [4+2] Cycloadditions and Intramolecular [3+2] Cross-Cycloadditions of Dienylcyclopropane 1,1-Diesters
作者:Zhongwen Wang、Jun Ren、Jilai Bao、Weiwei Ma
DOI:10.1055/s-0034-1378897
日期:——
A novel tandem reaction by combination of Diels–Alder [4+2] cycloaddition and [3+2] IMCC (intramolecular cross-cycloaddition) of dienylcyclopropane 1,1-diesters has been successfully developed. In this reaction, three new rings and four new stereocenters were generated in one-pot. This supplies a strategy for rapid construction of 6,6- and 6,7-fused carbocyclic skeletons which are common cores in
Stereodivergent Methodology for the Synthesis of Complex Pyrrolidines
作者:Stephen K. Jackson、Avedis Karadeolian、Alex B. Driega、Michael A. Kerr
DOI:10.1021/ja710289k
日期:2008.3.1
serve as precursors to the ubiquitous pyrrolidine motif. A simple reversal of addition order of catalyst and substrate results in formation of two discrete diastereomers in a highly selective and predictable manner. The adducts are prepared in excellent yields from either enantiomer of an alkoxyamino-tethered cyclopropanediester, allowing efficient access to highly substituted homochiral pyrrolidines
Intermolecular Organophotocatalytic Cyclopropanation of Unactivated Olefins
作者:David M. Fischer、Henry Lindner、Willi M. Amberg、Erick M. Carreira
DOI:10.1021/jacs.2c11680
日期:2023.1.18
Intermolecular cyclopropanation of mono-, di-, and trisubstituted olefins with α-bromo-β-ketoesters and α-bromomalonates under organophotocatalysis is reported. The reaction displays broad functional group tolerance, including substrates bearing acids, alcohols, halides, ethers, ketones, nitriles, esters, amides, carbamates, silanes, stannanes, boronic esters, as well as arenes, and furnishes highly