Pd(II)/Cu(II)-Catalyzed Regio- and Stereoselective Synthesis of (<i>E</i>)-3-Arylmethyleneisoindolin-1-ones Using Air as the Terminal Oxidant
作者:So Won Youn、Tae Yun Ko、Young Ho Kim、Yun Ah Kim
DOI:10.1021/acs.orglett.8b03409
日期:2018.12.21
Regio- and stereoselective synthesis of (E)-3-arylmethyleneisoindolin-1-ones via Pd(II)/Cu(II)-catalyzedone-pot C–C/C–N bond forming sequence between amides and styrenes is reported. This method provides facile and rapid access to a diverse range of such compounds using readily available starting materials under mild aerobic conditions with good functional group tolerance and high selectivity and efficiency
Heteroannulation enabled by a bimetallic Rh(<scp>iii</scp>)/Ag(<scp>i</scp>) relay catalysis: application in the total synthesis of aristolactam BII
作者:Wei-Wei Ji、E. Lin、Qingjiang Li、Honggen Wang
DOI:10.1039/c7cc02105d
日期:——
redox-neutral bimetallic Rh(III)/Ag(I) relay catalysis allowed the efficient construction of 3-alkylidene isoindolinones and 3-alkylidene isobenzofuranones. The Rh(III) catalyst was responsible for the C–H monofluoroalkenylation reaction, whereas the Ag(I) salt was an activator for the follow-up cyclization. The methodology developed was applied as a key step in the rapid totalsynthesis of the natural product
Phosphazene Superbase-Mediated Regio- and Stereoselective Iodoaminocyclization of 2-(1-Alkynyl)benzamides for the Synthesis of Isoindolin-1-ones
作者:Saurabh Mehta、Dhirendra Brahmchari
DOI:10.1021/acs.joc.9b00452
日期:2019.5.3
exclusive formation of products with Z-geometry (across the exo C═C bond) has been confirmed through X-raycrystallography. The methodology also provides an easy access to aristolactams, an important class of natural products. This has been successfully demonstrated by synthesizing two aristolactam derivatives (including Cepharanone B).
Total synthesis of aristolactam alkaloids via synergistic C–H bond activation and dehydro-Diels–Alder reactions
作者:Mallu Chenna Reddy、Masilamani Jeganmohan
DOI:10.1039/c7sc00161d
日期:——
concise total synthesis of aristolactam alkaloids by a synergistic combination of C–H bond activation and dehydro-Diels–Alder reactions is described. To achieve the synthesis two new synthetic methodologies, namely the oxidative cyclization of benzamides with vinyl sulfone leading to 3-methyleneisoindolin-1-ones via a ruthenium-catalyzed C–H bond activation, and a dehydro-Diels–Alder reaction followed by
An efficient, concise and tactically new synthesis of aristolactams is described. The key step is the aryne-mediated cyclization of an amino carbanion derived from a phosphorylated halobenzamide derivative. Horner reaction, radical cyclization and ultimate deprotection complete the synthesis of the phenanthrene lactam alkaloids. The viability of the strategy is further illustrated by the synthesis of cepharanone A and B.