- Design and synthesis of C2-symmetric N-heterocyclic carbene precursors and metal carbenoids
-
Chiral, C2-symmetric imidazolium and imidazolinium ions, as well as the corresponding copper- or silver-bound carbenoids, have been prepared. Structural study of these compounds by X-ray crystallography reveals a chiral pocket that surrounds th
- Albright, Abigail,Eddings, Daniel,Black, Regina,Welch, Christopher J.,Gerasimchuk, Nikolay N.,Gawley, Robert E.
-
scheme or table
p. 7341 - 7351
(2011/11/06)
-
- Pd-catalyzed intermolecular ortho-C-H amidation of anilides by N-nosyloxycarbamate
-
A palladium-catalyzed ortho-C-H amidation of anilides by N-nosyloxycarbamates was developed for the synthesis of 2-aminoanilines. This reaction can be carried out under relatively mild conditions and exhibits excellent regioselectivity and functional group tolerance. The amidation reaction is probably initiated by rate-limiting C-H cyclopalladation (k H/kD = 3.7) to form an arylpalladium complex, followed by nitrene functionalization.
- Ng, Ka-Ho,Chan, Albert S. C.,Yu, Wing-Yiu
-
supporting information; body text
p. 12862 - 12864
(2010/11/03)
-
- Synthetic approaches to haplophytine. 1. Synthesis of 1-methoxy- and 1-hydroxy-6-phenyl-6-(2-pivaloylamidophenyl)non-8-ene-4,5-dione and 1-methyl-3-phenyl-3-(pivaloylamidophenyl)-2-pyrrolidinone
-
An analysis of the structures of the alkaloid haplophytine and its dihydrobromide which is formed with rearrangement, shows that they are both derived from a 7-(2-amino-3-hydroxyphenyl)-7-aryl-9-(methylamino)-5,6-dioxonoanoic acid moiety (3).Approaches to the synthesis of compounds related to 3 are described.The dianion 13 of phenyl(2-pivaloylamidophenyl)methane, that of methyl 2-phenyl-2-(2-pivaloylamidophenyl)acetate, and the trianion 37 of 2-phenyl-2-(2-pivaloylamidophenyl)acetic acid undergo C-alkylation and C-acylation with nucleophiles.Acylation of 13 with methyl 2,2,5-trimethoxypentanoate followed by hydrolysis gives 6-methoxy-1-phenyl-1-(2-pivaloylamidophenyl)-2,3-hexanedione.This with allyl bromide and sodium carbonate gives O-allyl derivative, which on thermolysis is converted to its C-allyl isomer, 1-methoxy-6-phenyl-6-(2-pivaloylamidophenyl)non-8-ene-4,5-dione.The corresponding 1-hydroxy compound was prepared analogously via acylation of 13 with methyl tetrahydro-2-methoxyfuran-2-carboxylate.C-allylation of trianion 37 gives 2-phenyl-2-(2-pivaloylamidophenyl)pent-4-enoic acid, whose methyl ester on ozonolysis followed by treatment with methylamine hydrochloride and sodium cyanoborohydride gives 1-methyl-3-phenyl-3-(2-pivaloylamidophenyl)-2-pyrrolidinone, a potential advanced intermediate for the synthesis of compounds related to 3.
- Yates, Peter,Schwartz, David Aaron
-
p. 509 - 518
(2007/10/02)
-