Rhodium(<scp>ii</scp>)-catalysed generation of cycloprop-1-en-1-yl ketones and their rearrangement to 5-aryl-2-siloxyfurans
作者:Kostiantyn O. Marichev、Yi Wang、Alejandra M. Carranco、Estevan C. Garcia、Zhi-Xiang Yu、Michael P. Doyle
DOI:10.1039/c8cc05623d
日期:——
Donor–acceptor cyclopropenes formed from enoldiazoketones undergo catalytic rearrangement to 5-aryl-2-siloxyfurans via a novel mechanism that involves a nucleophilic addition of the carbonyl oxygen to the rhodium-activated cyclopropene.
Synthesis of functionalized furan derivatives by hydroxyalkylation of methyl 2-siloxycyclopropanecarboxylates
作者:Christiane Brückner、Hans-Ulrich Reissig
DOI:10.1039/c39850001512
日期:——
A variety of methyl tetrahydrofuran-3-carboxylates (4) or the 5-oxo analogues (6) are available in good overall yield by deprotonation of cyclopropanes (1), addition of carbonyl compounds, ring cleavage, and reductive or oxidative work-up, respectively.
Chemo- and Regioselective Cyclohydrocarbonylation of α-Keto Alkynes Catalyzed by a Zwitterionic Rhodium Complex and Triphenyl Phosphite
作者:Bernard G. Van den Hoven、Bassam El Ali、Howard Alper
DOI:10.1021/jo000230w
日期:2000.6.1
alpha-Keto alkynes react with CO and H-2 in the presence of catalytic quantities of the zwitterionic rhodium complex (eta(6)-C6H5BPh3)Rh--(+)(1,5-COD) and triphenyl phosphite affording either the 2-, 2(3H)-, or 2(5H)-furanones in 61-93% yields. The cyclohydrocarbonylation is readily accomplished using substrates containing alkyl, aryl, vinyl, and alkoxy groups at the acetylenic terminal, as well as a variety of primary, secondary, and tertiary alkyl, aryl, and heteroaryl groups connected to the ketone functionality. Structural and electronic properties present in the starting materials mediate the chemo- and regioselectivity of the reaction.
Catalytic iron-mediated carbon-oxygen and carbon-carbon bond formation in [4 + 1] assembly of alkylidenebutenolides
作者:Matthew S. Sigman、Charles E. Kerr、Bruce E. Eaton
DOI:10.1021/ja00069a081
日期:1993.8
BRUCKNER, CHRISTIANE;REISSIG, HANS-ULRICH, J. ORG. CHEM., 53,(1988) N 11, 2440-2450