Synthesis of isochromans via Fe(OTf)2-catalyzed Oxa-Pictet–Spengler cyclization
作者:Jimei Zhou、Chao Wang、Dong Xue、Weijun Tang、Jianliang Xiao、Chaoqun Li
DOI:10.1016/j.tet.2018.10.028
日期:2018.12
Fe(OTf)2 has been found to be an efficient catalyst for the Oxa-Pictet–Spengler cyclization reaction leading to isochromans. A series of substituted isochromans were obtained with good to excellent isolated yields by coupling β-arylethanols with aldehydes or ketals under the catalysis of 1 mol% of Fe(OTf)2 at 70 °C. Using a cheap, less-toxic catalyst with water as the only byproduct, this iron-catalyzed
Direct oxidative C(sp3) H cyanation of secondary benzylic ethers
作者:Zehua Wang、Ying Mao、Honghao Guan、Min Cao、Jing Hua、Lei Feng、Lei Liu
DOI:10.1016/j.cclet.2019.03.019
日期:2019.6
Abstract Current studies on the oxidativeCH functionalization of benzylic ethers for CC forging process dominantly focus on primary ethers. The corresponding reaction of secondary ethers remains underdeveloped. Herein, a practical and efficientoxidativeCH cyanation of secondary benzylic ethers with TMSCN in the presence of DDQ is described. The metal-free process is well tolerated with a wide
Cross-dehydrogenative coupling of secondary benzylic ethers with indoles and pyrroles
作者:Min Cao、Ying Mao、Jiancheng Huang、Yudao Ma、Lei Liu
DOI:10.1016/j.tetlet.2019.03.032
日期:2019.4
Current studies on cross-dehydrogenative coupling of benzylic ethers for new C–C bond construction predominantly focus on primary ether moieties. Oxidative cross-coupling of secondary benzylic ethers remains elusive. Herein, we describe the first cross-dehydrogenative coupling of secondary benzylic ethers with indoles and pyrroles for tertiary ether construction. A broad range of α-aryl substituted