Regioselective synthesis of substituted 1-methyl- and 2-methylnaphthalenes
作者:K Mallik Yadav、Pramod K Mohanta、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1016/0040-4020(96)80832-5
日期:1996.10
Regiospecificallysubstituted 1-methyl- and 2-methylnaphthalenes, 5-methyl- and 6-methyl-1,2,3,4-tetrahydroanthracenes have been synthesized in good yields through 1,2- addition of the corresponding α-lithio-o-or m-xylenes onto α-oxoketenedithioacetals or their dihydro derivatives followed by cyclodehydration of the resulting carbinols in the presence of borontrifluoride etherate.
Polycyclic aromatic hydrocarbons are difficult substrates for hydrogenation because of the thermodynamic stability caused by aromaticity. We report here the first chromium- and cobalt-catalyzed, regiocontrolled hydrogenation of polycyclic aromatic hydrocarbons at ambient temperature. These reactions were promoted by low-cost chromium or cobalt salts combined with diimino/carbene ligand and methylmagnesium
Nickel-catalyzed cocyclotrimerization of arynes with diynes; a novel method for synthesis of naphthalene derivatives
作者:Jen-Chieh Hsieh、Chien-Hong Cheng
DOI:10.1039/b415691a
日期:——
The NiBr2(dppe)–Zn system effectively catalyzes the [2 + 2 + 2] cocyclotrimerization of arynes with diynes, leading to substituted naphthalene derivatives in moderate to good yields. This cocyclotrimerization reaction shows excellent tolerance of functional groups and leads to products of 5- to 7-membered fused-ring sizes
A photoannulation route to naphthalenes from cyclic ketones
作者:Robert J. Olsen、John C. Minniear、W. Mack Overton、John M. Sherrick
DOI:10.1021/jo00003a018
日期:1991.2
A three-step naphthalene annulation of cyclic ketones has been developed. Aldol condensation with an aromatic aldehyde followed by Wittig olefination produces a 1,3-diene, which undergoes oxidative photocyclization to produce a naphthalene derivative. Ketone ring sizes of C5 to C8 were annulated successfully. The sequence was also applied successfully to three methyl-substituted derivatives and one polycyclic case.
OLSEN, ROBERT J.;MINNIEAR, JOHN C.;OVERTON, W. MACK;SHERRICK, JOHN M., J. ORG. CHEM., 56,(1991) N, C. 989-991
作者:OLSEN, ROBERT J.、MINNIEAR, JOHN C.、OVERTON, W. MACK、SHERRICK, JOHN M.