BtCH<sub>2</sub>TMS-Assisted Homologation of Carboxylic Acids: A Safe Alternative to the Arndt−Eistert Reaction
作者:Alan R. Katritzky、Suoming Zhang、Yunfeng Fang
DOI:10.1021/ol0002370
日期:2000.11.1
3-benzotriazole (BtCH(2)TMS) (1) to afford N-(acylmethyl)benzotriazoles 3a-f, followed by (ii) conversion of 3a-f with triflic anhydride into RC(OTf)=CHBt 4a-f, and (iii) the subsequent reaction of 4a-c with NaOCH(3) followed by 1N HCl to afford esters RCH(2)CO(2)R' 7a-c in overall yields of 50-70%. For the aliphatic compounds 5d-f, treatment of 5d-f with p-toluenesulfonic acid followed by TBAF/THF
通过(i)用1-[((三甲基甲硅烷基)甲基] -1H-1,2,3-苯并三唑(BtCH(2)TMS)(1)处理酰氯来获得羧酸的一碳同系物-(酰基甲基)苯并三唑3a-f,然后(ii)将3a-f与三氟甲磺酸酐转化为RC(OTf)= CHBt 4a-f,以及(iii)随后4a-c与NaOCH(3)反应用1N HCl制得酯RCH(2)CO(2)R'7a-c,总产率为50-70%。对于脂族化合物5d-f,先用对甲苯磺酸处理5d-f,再用TBAF / THF处理,得到酸RCH(2)COOH 7d-f。