Reductive heterocyclizations via indium–iodine-promoted conversion of 2-nitroaryl imines or 2-nitroarenes to 2,3-diaryl-substituted indazoles
作者:Gil Hwan Ahn、Jung June Lee、Young Moo Jun、Byung Min Lee、Byeong Hyo Kim
DOI:10.1039/b707240f
日期:——
N-(2-nitrobenzylidene)anilines produced mixtures of 2,1-benzisoxazoles and 3-anilino-2-aryl-2H-indazoles in the presence of indium and iodine in MeOH, N-(2-nitrobenzylidene)anilines were transformed into 3-anilino-2-aryl-2H-indazoles as the predominant major product through the change of the solvent from protic MeOH to aprotic THF. In an indium-mediated one-pot reductive reaction, 2-benzaldehydes and anilines in THF
Reductive ring opening of 2-azetidinones promoted by sodium borohydride
作者:Paola Del Buttero、Giorgio Molteni、Maurizio Roncoroni
DOI:10.1016/j.tetlet.2006.01.103
日期:2006.3
Variously substituted 2-azetidinones 3 and 4 were reacted with sodiumborohydride in aqueous isopropanol giving 3-aminopropan-1,2-dioles 5 and 7. Reaction extent was dependent upon the substitution pattern in the 3- and 4-positions of the 2-azetidinone ring and revealed good correlation with carbonyl LUMO energies of starting 3.
A newphotochromic colorant with an oxazabicyclic moiety has been synthesized by an efficient method. It turns pale red upon UV irradiation and undergoes reverse reaction while being heated. This work may open an exciting new avenue for future development of the photochromic dyes with novel molecular structures.
Asymmetric synthesis catalyst based on chiral brsnsted acid and method of asymmetric synthesis with the catalyst
申请人:Akiyama Takahiko
公开号:US20060276329A1
公开(公告)日:2006-12-07
A compound usable as an asymmetric synthesis catalyst which can be easily synthesized without using any metal such as a lanthanoid group element; a method of asymmetric synthesis with the compound; and a chiral compound obtained by the asymmetric synthesis method. A Broensted acid is used as a catalyst in asymmetric synthesis, the chiral Broensted acid being represented by formula (1) below or formula (3) below. The asymmetric synthesis method employs the catalyst. Asymmetric synthesis with the catalyst gives a chiral compound.