Hydrogenation was only the beginning: Hantzsch esters have now been used to transferalkyl groups to imines under mild catalytic conditions to provide a variety of amines (see scheme). Benzyl, secondary alkyl, and tertiary alkyl groups containing ether, ester, and hydroxy functionalities were transferred successfully. The use of Hantzsch esters as alkylation reagents offers a practical and complementary
TBHP/KI-Promoted Annulation of Anilines, Ethers, and Elemental Sulfur: Access to 2-Aryl-, 2-Heteroaryl-, or 2-Alkyl-Substituted Benzothiazoles
作者:Jie Zhang、Xin Zhao、Ping Liu、Peipei Sun
DOI:10.1021/acs.joc.9b02145
日期:2019.10.4
TBHP/KI-promoted annulation of anilines with ethers and elemental sulfur has been developed through the selective C-O bond cleavage of ethers under transition-metal-free conditions. A wide range of 2-aryl-, 2-heteroaryl-, and 2-alkyl-substituted benzothiazoles were easily prepared with satisfactory yields and good functional group compatibility.
The condensation of 2-aminothiophenol with aliphatic aldehydes in the presence of 4Å molecular sieves, followed by oxidation with silica gel supported pyridinium chlorochromate offers a simple and efficient route to 2-alkylbenzothiazoles.
在 4 Å 分子筛存在下,2-氨基苯硫酚与脂肪醛缩合,然后用硅胶支撑的氯铬酸吡啶氧化,为 2-烷基苯并噻唑的制备提供了一条简单而有效的途径。