Palladium-Catalyzed Arylation of Ketones and Acetonitrile with <i>Ortho</i> Alkylation of Aryl Rings: De Novo Synthesis of Tetralines and Benzocycloheptenes
作者:Chuanhu Lei、Jiajia Cao、Jianrong (Steve) Zhou
DOI:10.1021/acs.orglett.6b03130
日期:2016.12.2
Palladium-catalyzed α-arylation reactions of ketones with simultaneous ortho alkylation offer 1,2,3-substituted arenes. The reactions of 1,ω-dihaloalkanes also allow facile construction of medicinally important tetralines and benzocycloheptenes.
The reactions of metastable [C5 H10 O]+˙ ions with the oxygen on the second carbon
作者:David J. McAdoo、Charles E. Hudson、Fred W. McLafferty、Terry E. Parks
DOI:10.1002/oms.1210190802
日期:1984.8
AbstractNearly all [C5H10O]+˙ isomers with the oxygen on the second carbon are shown to interconvert with each other and lose methyl and ethylene at the threshold for dissociation. The methyls contain the carbons from the 1‐ and 5‐positions with about equal frequency, and C(3) or perhaps C(4) about half as often as either terminal carbon. CH3 CH2 CH2 CO+ is formed by loss of the C(1) methyl and magnified image by loss of the C(5) methyl. Hydorgen transfer between C(5) and the oxygen and between the oxygen and C(4) are facile, and 1,2‐hydrogen transfers between C(3) and C(4) occur with high frequency. Extensive skeletal rearrangements also take placae by 1,2‐shifts between C(2), C(3) and C(4). We attribute the occurrence of teh three‐center shifts between C(2), C(3) and C(4) to the presence of considerable charge density on C(2) and C(3) in many of the [C5H10O]+˙ isomers. The isomerizations of [C5H10O]+˙ can be considered a mixture of free radical and carbocation reactions. Strong similarities exist between the isomerizations of metastable [C5H10O]+˙ ions with the oxygen on the second carbon and those of isomers of ionized butanoic acid, methyl butanoate and n‐butanal.