Chiral aldehyde catalysis is uniquely suitable for the direct asymmetric α-functionalization of N-unprotected amino acids, because aldehydes can reversibly form imines. However, there have been few successful reports of these transformations. In fact, only chiral aldehyde catalyzed aldol reactions of amino acids and alkylation of 2-amino malonates have been reported with good chiral induction. Here
Pd-catalyzed intramolecular C–H addition of indoles bearing cyanohydrin components at the C(3), C(2), and N(1) positions to nitriles is described. A wide range of functionalized partially saturated carbazoles, tetrahydropyrido[1,2-a]indole, and carbazoles can be prepared in good to excellent yields under the optimal conditions. In addition, fused polycyclic indoles with seven- or eight-membered rings
描述了钯催化分子内C–H加成腈在腈C(3),C(2)和N(1)位置上带有氰醇成分的第一个例子。可以在最佳条件下以良好或优异的收率制备各种官能化的部分饱和咔唑,四氢吡啶并[1,2- a ]吲哚和咔唑。另外,也可以平滑地形成具有七元或八元环的稠合多环吲哚。
Transition metal-free access to 3,4-dihydro-1,2-oxaphosphinine-2-oxides from phosphonochloridates and chalcones through tandem Michael addition and nucleophilic substitution
A novel and transition metal-free synthesis of 3,4-dihydro-1,2-oxaphosphinine 2-oxides was developed. LiHMDS-mediated tandem Michael addition and nucleophilicsubstitution of readily available phosphonochloridates and chalcones afforded a variety of valuable 3,4-dihydro-1,2-oxaphosphinine 2-oxides bearing diverse functionalities in excellent yields and satisfactory to good diastereoselectivity (up
Regio- and diastereoselective construction of a new set of functionalized pyrrolidine, spiropyrrolidine and spiropyrrolizidine scaffolds appended with aryl- and heteroaryl moieties via the azomethine ylide cycloadditions
Highly regio- and diastereoselective syntheses of a new set of functionalized pyrrolidines, spiro-pyrrolidine/pyrrolizidine oxindoles, spiroacenaphthylenolyl-pyrrolidines/pyrrolizidines and spiro-1,3-indandionolyl-pyrrolidines/pyrrolizidines appended with various aryl- and heteroaryl moieties via the azomethine ylide cycloaddition reaction are reported. The Ag-catalyzed [3+2] cycloaddition of azomethine
Construction of benzo[a]carbazole derivatives via Diels–Alder reaction of arynes with vinylindoles
作者:Lijun Wu、Hui Huang、Pan Dang、Yun Liang、Shaofeng Pi
DOI:10.1039/c5ra11025d
日期:——
A new protocol for a highly efficienct and versatile Diels–Alder reaction of vinylindoles with arynes (generated form 2-(trimethylsilyl)aryl triflate) has been developed. Various functionalized benzo[a]carbazoles were afforded in good to perfect yields via [4 + 2] cycloaddition/aromatization.
已经开发出一种新的协议,用于乙烯基吲哚与芳烃的高效狄斯-阿尔德反应(生成形式为2-(三甲基甲硅烷基)芳基三氟甲磺酸酯)。通过[4 + 2]环加成/芳构化,可以提供各种官能化的苯并[ a ]咔唑,收率良好至理想。