β-Elimination of the isonitrile group in alkylation reactions of C–H acids activated by the isonitrile function
作者:Mikołaj Jawdosiuk、Maciej Umiński
DOI:10.1039/c39820000979
日期:——
During phase-transfer alkylation of the isonitriles R1R2CHNC with X–CH2–Y, where X is a leaving group and Y an electron withdrawing group, some of the alkylation products undergo β-elimination of the isonitrilefunction to yield R1R2CCHY.
在异氰酸酯R 1 R 2 CHNC用X–CH 2 –Y进行相转移烷基化的过程中,其中X是一个离去基团,Y是一个吸电子基团,一些烷基化产物会经历β-消除的异腈官能团,从而生成R 1 R 2 C CHY。
Photochemical reactions of chromium-alkoxycarbene complexes with stabilized ylides to produce push-pull captodative allenes
作者:Michael R. Sestrick、Michael Miller、Louis S. Hegedus
DOI:10.1021/ja00037a008
日期:1992.5
Photolysis of chromium alkoxycarbene complexes in the presence of stabilized ylides produced allenes having effect withdrawing groups on C-1 and electron donating groups on C-3. These highly reactive captodative allenes rearranged to 1,3-substituted-1,3-dienes under mildly acidic conditions and hydrolyzed to γ-ket-α,β-unsaturated esters, both in excellent yield
Remarkable substituent effects on the chemoselectivity of rhodium(II) carbenoids derived from N-(2-diazo-3-oxobutyryl)-L-phenylalanine esters
作者:Florencio Zaragoza
DOI:10.1016/0040-4020(95)00464-j
日期:1995.8
Four different N-(alkyl/aryl)-N-(2-diazo-3-oxobutyryl)-L-phenylalanine methyl esters 1b-e have been synthesized and subjected to rhodium(II) acetate catalyzed diazodecomposition. Thereby a strong dependence of the product distribution from the type of nitrogen bound substituent was observed. The bis(4-chlorophenyl)methyl derivative 1b provided similar products in comparable yields as the benzhydryl
A simple route to 9-fluorenylidenes by domino Suzuki/Heck coupling reactions
作者:Sunanda Paul、Tumpa Gorai、Arijit Koley、Jayanta K. Ray
DOI:10.1016/j.tetlet.2011.05.148
日期:2011.8
A palladium catalyzed domino intermolecular Suzuki followed by intramolecular Heck coupling is described. This strategy afforded a novel and convenient synthesis of various 9-fluorenylidene derivatives in one-pot under relatively mild reaction condition. (C) 2011 Elsevier Ltd. All rights reserved.