Wittig rearrangement of 3-furylmethyl ethers and its application to the synthesis of dendrolasin
作者:Masayoshi Tsubuki、Hiroyuki Okita、Toshio Honda
DOI:10.1039/c39950002135
日期:——
The Wittig rearrangement of 3-furylmethyl ethers 1, proceeds efficiently to give 3-methyl-2-furylmethanols 2 or 3-furylethanols 3 depending on the basicity of the butyllithium used; synthesis of dendrolasin is achieved with the 1,2-rearrangement of 3-furylmethyl geranyl ether 5 as a key step.
Wittigrearrangement of 3-furylmethyl ethers la-i was investigated. Deprotonation of 3-furylmethyl ethers la-i with bases, such as BuLi and LDA, occurred preferentially at the allylic, propargylic, benzylic positions and α-position adjacent to carbonyl group giving the corresponding anions, which underwent 2,3- and 1,2-rearrangements to afford 3-methyl-2-furylmethanols 2a-i and 3-furylethanols 3a-f