A convenient route to polyfunctionalised indeno[ 1,2 - b ]pyran derivatives
摘要:
2-Arylidene-1,3-indanediones undergo facile formal hetero-Diels-Alder cycloadditions with ynamines bearing electron-withdrawing groups yielding polyfunctionalised indeno[1,2-b]pyrans.
Oligosubstituted Pyrroles Directly from Substituted Methyl Isocyanides and Acetylenes
作者:Alexander V. Lygin、Oleg V. Larionov、Vadim S. Korotkov、Armin de Meijere
DOI:10.1002/chem.200801395
日期:2009.1
methyl isocyanides 1 onto the triple bond of electron‐deficient acetylenes 2 represents a direct and convenient approach to oligosubstituted pyrroles 3. The scope and limitations of this reaction (24 examples, 25–97 % yield) are reported along with an optimization of the reaction conditions and a rationalization of the mechanism. In addition, a related newly developed CuI‐mediated synthesis of 2,3‐disubstituted
In view of possible solid-state polymerizations of crystalline stacked 'push-pull'-acetylenes 1. a series of compounds 1 has been synthesized (Scheme 3), and the results of,X-ray analyses of 'push-pull'-acetylenes Id,e,f are discussed. Of these three compounds, methyl 2-morpholinoacetylene carboxylate (Id) is by far the best candidate giving crystals with nicely stacked molecules (Fig. 3). Even in this case, however, stacking parameters d= 4,12 Angstrom and alpha = 31,6 degrees are too large for allowing solid-state polymerizations.
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