<i>N</i>,<i>N</i>′-Carbonyldi[2(3<i>H</i>)-benzoxazolethione]: New, Reactive Condensing Agent for the Synthesis of Amides, Esters, Peptides, and Polyamides
作者:Mitsuru Ueda、Naomi Kawaharasaki、Yoshio Imai
DOI:10.1246/bcsj.57.85
日期:1984.1
N′-carbonyldi[2(3H)-benzoxazolethione] (3), was readily prepared by the reaction of 2-benzoxazolethiol and trichloromethyl chloroformate in benzene. The condensing agent 3 is shown to be useful for the preparation of amides, esters, and dipeptides under mild conditions. A successful polyamide synthesis by the polycondensation of isophthalic acid with diamines using 3 is also described.
Acylation and Alkoxycarbony-lation of Benzoxazoline-2-thione and Benzothiazoline-2-thione
作者:Takehiko Nishio、Kiyoko Shiwa
DOI:10.3987/com-03-s(p)10
日期:——
Acylation of benzoxazoline-2-thione (1) and benzothiazoline-2-thione (2) with acetic anhydride (3) and acyl chlorides (4) gave N-acyl (5, 6) and/or S-acyl (7, 8) derivatives depending on the nature of acylating agents and bases used. Alkoxycarbonylation of 1 with aralkyl chlorocarbonates (9) gave N-alkoxycarbonyl derivatives (10) mainly, while that of 2 with aralkyl chloroccarbonates (9) gave S-alkoxycarbonyl derivatives (12) exclusively. Photolysis of N-acyl derivatives (5 or 6) in the presence of alcohols afforded 1 or 2, respectively, together with esters (16).
<i>S</i>- and<i>N</i>-Acyl Derivatives of 2-Mercaptobenzoxazole; New, Highly Reactive Acylating Agents for Synthesis of Amides and Esters
作者:Mitsuru Ueda、Kouji Seki、Yoshio Imai
DOI:10.1055/s-1981-29674
日期:——
3-(Benzothiazol-2-ylthio)- and 3-(Benzoxazol-2-ylthio)-1,2-benzisothiazole 1,1-Dioxides; New, Reactive Condensing Agents for the Synthesis of Amides and Esters
作者:Mitsuru Ueda、Naomi Kawaharasaki、Yoshio Imai
DOI:10.1055/s-1982-30003
日期:——
Zinner; Niendorf, Chemische Berichte, 1956, vol. 89, p. 1012,1014