A new method is reported for the conversion of azidoacids into lactams, via thioester formation and in situ azide reduction and cyclisation under high-dilution conditions; since the quantitative conversion of macrolactams to macrolactones has been shown to be feasible, this results in an indirect, alternative macrolactonisation procedure.
YAMAMOTO, YOSHINORI;FURUTA, TOSHIAKI, CHEM. LETT.,(1989) N, C. 797-800
作者:YAMAMOTO, YOSHINORI、FURUTA, TOSHIAKI
DOI:——
日期:——
Incorporation of La<sup>3+</sup>in an Organic Network. A Polyphenol-Derived Solid Brønsted-Base Catalyst
作者:Toshiyuki Saiki、Yasuhiro Aoyama
DOI:10.1246/cl.1999.797
日期:1999.8
Treatment of anthracenebisresorcinol 1 (a tetraphenol) with La(OiPr)3 in THF affords an amorphous 1:2 (14− to La3+) coordination polymer (La host). It catalyzes typical base-promoted reactions such as Michael, nitroaldol, and, less effectively, aldol reactions, where the insoluble catalyst (La host) can be readily recovered and repeatedly used.