Heterocycle Formation via Palladium-Catalyzed Intramolecular Oxidative C−H Bond Functionalization: An Efficient Strategy for the Synthesis of 2-Aminobenzothiazoles
作者:Laurie L. Joyce、Robert A. Batey
DOI:10.1021/ol900958z
日期:2009.7.2
N-Arylthioureas are converted to 2-aminobenzothiazoles via intramolecular C−S bond formation/C−H functionalization utilizing an unusual cocatalytic Pd(PPh3)4/MnO2 system under an oxygen atmosphere at 80 °C. This method eliminates the need for an ortho-halo substituted precursor, instead achieving direct functionalization of the ortho-aryl C−H bond. Mechanistic observations, including a large intramolecular
Viswanathan, N.; Sidhaye, A. R., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1986, vol. 25, p. 659 - 660
作者:Viswanathan, N.、Sidhaye, A. R.
DOI:——
日期:——
VISWANATHAN N.; SIDHAYE A. R., INDIAN J. CHEM., 25,(1986) N 6, 659-660
作者:VISWANATHAN N.、 SIDHAYE A. R.
DOI:——
日期:——
Arylthioureas with bromine or its equivalents gives no ‘Hugerschoff’ reaction product
作者:Ramesh Yella、Siva Murru、Abdur Rezzak Ali、Bhisma K. Patel
DOI:10.1039/c003892j
日期:——
The in situ generated arylâalkyl unsymmetrical thiourea obtained by the reaction of an aryl isothiocyanate with an aliphatic secondary amine on treatment with bromine or its equivalent gave exclusively a product having a thioamido guanidino moiety and not the expected Hugerschoff product 2-aminobenzothiazole. A plausible reaction mechanism has been proposed for this unprecedented transformation and the scope has been extended to various substrates.