Rhodium-Catalyzed Asymmetric N−H Functionalization of Quinazolinones with Allenes and Allylic Carbonates: The First Enantioselective Formal Total Synthesis of (−)-Chaetominine
作者:Yirong Zhou、Bernhard Breit
DOI:10.1002/chem.201705059
日期:2017.12.22
An unprecedented asymmetric N−H functionalization of quinazolinones with allenes and allylic carbonates was successfully achieved by rhodium catalysis with the assistance of chiral bidentate diphosphine ligands. The high efficiency and practicality of this method was demonstrated by a low catalyst loading of 1 mol % as well as excellent chemo‐, regio‐, and enantioselectivities with broad functional
A nickel-catalyzed reductive cross coupling with phosphonium salts and allylic C(sp3)–O bond electrophiles, which granted direct construction of the C(sp2)–C(sp3) bond, is successfully developed. The protocol features broad substrate scope, high-functional-group tolerance, and heterocycle compatibility. Notably, the much more challenging reductive cross coupling with heterocyclic thiazolylphosphonium
Tandem Catalytic Allylic Amination and [2,3]-Stevens Rearrangement of Tertiary Amines
作者:Arash Soheili、Uttam K. Tambar
DOI:10.1021/ja204717b
日期:2011.8.24
have developed a catalytic allylic amination involving tertiary aminoesters and allylcarbonates, which is the first example of the use of tertiary amines as intermolecular nucleophiles in metal-catalyzed allylic substitution chemistry. This process is employed in a tandem ammonium ylide generation/[2,3]-rearrangement reaction, which formally represents a palladium-catalyzed Stevens rearrangement. Low
Lewis Acid Mediated Domino Intramolecular Cyclization: Synthesis of Dihydrobenzo[<i>a</i>]fluorenes
作者:Dakoju Ravi Kishore、Chander Shekhar、Gedu Satyanarayana
DOI:10.1021/acs.joc.1c00525
日期:2021.7.2
An efficient and facile method for the regioselective synthesis of novel dihydrobenzo[a]fluorenes from readily accessible alkynols is presented. The current strategy triggers the formation of a dual C–C bond intramolecularly via Lewisacid catalysis under mild reaction conditions. Notably, secondary as well as tertiaryalcohols bearing an alkyne moiety have been smoothly transformed into the corresponding
提出了一种从容易获得的炔醇区域选择性合成新型二氢苯并 [ a ] 芴的有效且简便的方法。目前的策略通过路易斯酸催化在温和的反应条件下触发分子内双 C-C 键的形成。值得注意的是,带有炔烃部分的仲醇和叔醇已顺利转化为相应的产品。结果,已经使用这种方法完成了新型四环二氢苯并[ a ]芴。
Palladium‐Catalyzed Synthesis of α‐Methyl Ketones from Allylic Alcohols and Methanol
One-pot synthesis of α-methyl ketones starting from 1,3-diaryl propenols or 1-aryl propenols and methanol as a C1 source is demonstrated. This one-pot isomerization-methylation is catalyzed by commercially available Pd(OAc)2 with H2O as the only by-product. Mechanistic studies and deuterium labelling experiments indicate the involvement of isomerization of allyl alcohol followed by methylation through