An amidine compound represented by formula (I)
(wherein A1 represents a nitrogen atom or a group represented by formula CR6; A2 and A3 are the same as or different from each other and independently represent a nitrogen atom or a group represented by formula CH; R1 represents an aryl group which may be substituted by 1 to 5 substituents independently selected from a substituent group (2) or the like; R2 and R3 are the same as or different from each other and independently represent a hydrogen atom, a halogen atom, a C1-6 alkyl group, a C1-6 haloalkyl group or a C1-6 alkoxy group; and R4 and R5 are the same as or different from each other and independently represent a hydrogen atom, a C1-6 haloalkyl group, a C1-6 alkyl group or the like) or a salt thereof. The compound is useful as an anti-fungal agent.
A highly efficient formal [3 + 2]-cycloaddition was established using a copper catalyst. The resulting dihydrofurans were subjected to oxidation followed by arylations to produce tetraarylfurans. In addition, the dihydrofuran can be converted to diaryldihydrothiophene by using Lawesson's reagent. This protocol will facilitate the synthesis of all different aryl-substituted furans and thiophenes.
Kaye, Perry T.; Meakins, G. Denis; Smith, Anthony K., Journal of the Chemical Society. Perkin transactions I, 1983, # 8, p. 1677 - 1680
作者:Kaye, Perry T.、Meakins, G. Denis、Smith, Anthony K.、Tirel, Malcolm D.
DOI:——
日期:——
KAYE, P. T.;MEAKINS, G. D.;SMITH, A. K.;TIREL, M. D., J. CHEM. SOC. PERKIN TRANS., 1983, N 8, 1677-1680
作者:KAYE, P. T.、MEAKINS, G. D.、SMITH, A. K.、TIREL, M. D.