An Efficient, Overall [4+1] Cycloadditon of 1,3-Dienes and Nitrene Precursors
作者:Qiong Wu、Jian Hu、Xinfeng Ren、Jianrong Steve Zhou
DOI:10.1002/chem.201101630
日期:2011.10.4
Intermolecular cycloadditions of conjugated dienes and nitreneprecursors usually produce aziridines. A generally useful method was lacking to directly provide the [4+1] cycloadducts, 3‐pyrrolines. We have realized this transformation by using an uniquely active catalyst, copper(II) 1,1,1,5,5,5‐hexafluoroacetylacetonate ([Cu(hfacac)2]). The method is applicable to a wide array of dienes with good yields
undergo the Prins reaction with aldehydes in situ to afford conjugated homoallylic alcohols. These sequential transformations enable the conversion of diastereomeric mixtures of 3-hydroxy-4-pentenoic acids, which are readily prepared from the simple crossed aldol reaction of esters and α,β-unsaturatedaldehydes, into 3,5-hexadienyl alcohols with high regio- and stereoselectivities in a single manipulation
hydroalkylation of dienes with stabilized carbon nucleophiles has been made, hydroalkylation of dienes with unstabilized carbon nucleophiles has remained a challenge. In this article, we report a protocol for nickel-catalyzed hydroalkylation of dienes with hydrazones, which serve as equivalents of alkyl carbon nucleophiles. In addition, we developed a protocol for hydroalkenylation of dienes with α,β-unsaturated
from the presence of heteroatoms. Although considerable advances have recently been achieved in radical-involved catalytic asymmetric C–N bond formation, there has been little progress in the corresponding C–O bond-forming processes. Here, we describe a photoinduced copper-catalyzed cross-coupling of readily available oxime esters and 1,3-dienes to generate diversely substituted allylic esters with high
Ni-Catalyzed Site-Selective Dicarboxylation of 1,3-Dienes with CO<sub>2</sub>
作者:Andreu Tortajada、Ryo Ninokata、Ruben Martin
DOI:10.1021/jacs.7b13220
日期:2018.2.14
A site-selective catalytic incorporation of multiple CO2 molecules into 1,3-dienes en route to adipic acids is described. This protocol is characterized by its mildconditions, excellent chemo- and regioselectivity and ease of execution under CO2 (1 atm), including the use of bulk butadiene and/or isoprene feedstocks.
描述了一种位点选择性催化将多个 CO2 分子结合到 1,3-二烯到己二酸的过程中。该协议的特点是条件温和,具有出色的化学和区域选择性,并且在 (1 atm) 下易于执行,包括使用散装丁二烯和/或异戊二烯原料。