Pd-Catalyzed Intramolecular Aminoalkylation of Unactivated Alkenes: Access to Diverse <i>N</i>-Heterocycles
作者:Liu Ye、Kai-Yip Lo、Qiangshuai Gu、Dan Yang
DOI:10.1021/acs.orglett.6b03295
日期:2017.1.20
A highly efficient palladium-catalyzedintramolecular aminoalkylation of unactivatedalkenes in the absence of an external ligand and oxidant is described. New C–N and C(sp3)–C(sp3) bonds are formed simultaneously. This general transformation allows for construction of diverse N-heterocycles. Mechanistic studies show that the process may involve a four-membered Pd(alkyl)amido intermediate.
Nucleophilic addition of silyl enol ethers to aromatic nitro compounds: scope and mechanism of reaction
作者:T. V. RajanBabu、G. S. Reddy、Tadamichi Fukunaga
DOI:10.1021/ja00305a024
日期:1985.9
chloride are not displaced in the reaction, suggesting the absence of radical ion intermediates. Dihydroaromatic nitro derivatives can be isolated in some cases, such as anthracene and naphthalene systems which are less prone to rearomatize. The use of silicon reagents in organic synthesis has been ex- panding rapidly in the past few year^,^-^ and versatile methods for carbon-carbon bond formations have been
Hypervalent Iodine(III)-Promoted Intermolecular C–C Coupling of Vindoline with β-Ketoesters and Related Substrates
作者:Travis C. Turner、Kotaro Shibayama、Dale L. Boger
DOI:10.1021/ol400135n
日期:2013.3.1
regioselective intermolecular coupling reaction of vindoline with a wide range of substrates including β-ketoesters, β-diketones, β-ketoaldehydes, β-ketonitriles, malononitriles, and β-cyanoesters provides an opportunity for the synthesis of vinblastine analogues containing deep-seated changes in the upper velbanamine subunit. The transition-metal-free hypervalent iodine(III)-promotedintermolecular sp3/sp2
Palladium-Catalyzed Regiocontrolled α-Arylation of Trimethylsilyl Enol Ethers with Aryl Halides
作者:Tetsuo Iwama、Viresh H. Rawal
DOI:10.1021/ol062093g
日期:2006.12.1
Inter- and intramolecular arylations of trimethylsilylenolethers with aryl halides are accomplished regiospecifically in the presence of a palladium catalyst and tributyltin fluoride in refluxing benzene or toluene. The optimal catalyst system called for the use of Pd2(dba)3 and tri-tert-butylphosphine in ca. 1:2 ratio. Aryl iodides, bromides, and chlorides are all effective arylation partners in
alternatives to side-chain protection and deprotection in solid-phase peptide synthesis (SPPS). Several protectinggroups have been endorsed as suitable candidates, but finding a greener protectinggroup in SPPS has been challenging. Here, based on the 2-(o-nitrophenyl) propan-1-ol (Npp-OH) photolabileprotectinggroup, a structural modification was carried out to synthesize a series of derivatives. Through experimental