Synthesis of Alkynyl Ethers and Low-Temperature Sigmatropic Rearrangement of Allyl and Benzyl Alkynyl Ethers
作者:Juan R. Sosa、Armen A. Tudjarian、Thomas G. Minehan
DOI:10.1021/ol802147h
日期:2008.11.6
transformed into 1-alkynyl ethers 5 by a two-step procedure involving formation of the enol triflate or phosphate and base-induced elimination. Performing the same reaction sequence with allylic alcohols (R2OH, R2 = allyl) furnishes instead gamma,delta-unsaturated carboxylic acid derivatives 6, derived from [3,3]-sigmatropic rearrangement of the intermediate allyl alkynyl ethers at -78 degrees C and trapping
可以通过两步法将α-烷氧基酮3转化为1-炔基醚5,所述步骤包括形成三氟甲磺酸酯或磷酸烯醇酯和碱诱导的消除。用烯丙醇(R2OH,R2 =烯丙基)执行相同的反应顺序,可提供γ-δ-不饱和羧酸衍生物6,该衍生物衍生自中间体烯丙基炔醚的[3,3]-σ重排,并在-78℃下捕获随后形成的具有亲核试剂的烯酮(Nu-H)。加热到60摄氏度后,苄基炔基醚5(R2 =苄基)重排为茚满酮7。