Conjugate Addition of Trimethylsilylmethyl Cuprates to Artemisinic Acid: Homologation and Subsequent Conversion to 9β-Modified Artemisinin Analogs
作者:Jeffrey Vroman、Iklas Khan、Mitchell Avery
DOI:10.1055/s-1997-1065
日期:——
Conjugate addition to the acrylic acid moiety of artemisinic acid 2 was made possible by in situ protection as a silyl ester followed by treatment with a trimethylsilylmethyl cuprate such as (TMSCH2)C4H9CuLi•LiX, where X = CN or I. After deprotective workup, the homologated carboxylic acid 9 was obtained in excellent yields. Photoxygenation and acid treatment of 9 then led to the facile preparation of potent 9β-modified analogs of the naturally occurring antimalarial agent, artemisinin.
Conjugate Addition of a Cyano-Gilman Cuprate to an Acrylic Acid: Homologation of Artemisinic Acid and Subsequent Conversion to 16-Butylartemisinin
作者:Jeffrey A. Vroman、Hala N. ElSohly、Mitchell A. Avery
DOI:10.1080/00397919808006859
日期:1998.5
Abstract Conjugate addition to the acrylic acid moiety of artemisinicacid 2 was made possible by in situ protection as a silyl ester, treatment with a cyano-Gilman cuprate [Bu2CuLi·LiCN] to facilitate 1,4-addition, and deprotective workup affording the homologated carboxylic acid 9. Photoxygenation and acid treatment of 9 then led to the facile preparation of potent antimalarial 9-modified analogs