Dual Nickel-/Palladium-Catalyzed Reductive Cross-Coupling Reactions between Two Phenol Derivatives
作者:Baojian Xiong、Yue Li、Yin Wei、Søren Kramer、Zhong Lian
DOI:10.1021/acs.orglett.0c02165
日期:2020.8.21
Cross-coupling between substrates that can be easily derived from phenols is highly attractive due to the abundance of phenols. Here, we report a dual nickel-/palladium-catalyzed reductive cross-coupling between aryl tosylates and aryltriflates; both substrates can be accessed in just one step from readily available phenols. The reaction has a broad functional group tolerance and substrate scope (>60
secondary alcohol derivatives with high yields and excellent enantioselectivities. Particularly noteworthy is the utilization of aliphatic alcohols as nucleophiles in the asymmetric oxa-Michael step, overcoming obstacles associated with their direct utilization as Michael donors. Furthermore, a sequential process offers a novel synthetic strategy for constructing essential fluorinated chiral alcohols from
开发了一种不对称有机催化 oxa-Michael 反应来合成具有高产率和优异对映选择性的手性仲醇衍生物。特别值得注意的是在不对称的 oxa-Michael 步骤中使用脂肪醇作为亲核试剂,克服了直接用作 Michael 供体的障碍。此外,连续过程提供了一种新颖的合成策略,用于从容易获得的材料构建必需的氟化手性醇。
US7494760B2
申请人:——
公开号:US7494760B2
公开(公告)日:2009-02-24
Coupling of C(sp<sup>3</sup>)–H bonds with C(sp<sup>2</sup>)–O electrophiles: mild, general and selective
The general coupling of amine/ether C(sp3)–H bonds with alkenyl/(hetero)aryl C–O electrophiles is reported with high selectivity.
氨基/醚C(sp3)-H键与烯基/(杂)芳基C-O亲电试剂的普遍偶联反应报道了高选择性。
Synergistic Catalysis between a Dipeptide Phosphonium Salt and a Metal‐Based Lewis Acid for Asymmetric Synthesis of
<i>N</i>
‐Bridged [3.2.1] Ring Systems
作者:Yuan Chen、Jiajia He、Cheng Zhuang、Zanjiao Liu、Kai Xiao、Zhishan Su、Xiaoyu Ren、Tianli Wang
DOI:10.1002/anie.202207334
日期:2022.9.19
method for asymmetric construction of N-bridged [3.2.1] rings by a phosphoniumsalt/silver co-catalyzed cyclization has been developed. This route affords fluorine-installed tropane derivatives in excellent stereoselectivities. The mechanistic results revealed that the silver nitrite was installed on the phosphoniumsalt via hydrogen bonding and simultaneously activated the dipole, in a “sandwich” reaction