Total Syntheses of (±)-Crinine, (±)-Crinamine, and (±)-6a-<i>epi</i>-Crinamine via the Regioselective Synthesis and Diels−Alder Reaction of 3-Aryl-5-bromo-2-pyrone
作者:Nguyen Thanh Tam、Jayhyok Chang、Eun-Ju Jung、Cheon-Gyu Cho
DOI:10.1021/jo8008353
日期:2008.8.1
new unified synthetic protocol to (±)-crinine, (±)-crinamine, and (±)-6a-epi-crinamine from the Diels−Alder cycloadduct of 3-(3,4-methylenedioxyphenyl)-5-bromo-2-pyrone with TBS vinyl ether. The requisite 3-(3,4-methylenedioxyphenyl)-5-bromo-2-pyrone was prepared from the C3-selective Stille coupling reaction of 3,5-dibromo-2-pyrone. Also noted is that the vinyl bromide can be used as a handle for further
我们设计了一种新的统一合成方案,用于由3-(3,4-亚甲基二氧苯基)-5-的Diels-Alder环加成物中的(±)-可兰宁,(±)-可可胺和(±)-6a-表位-可可胺。溴-2-吡喃酮与TBS乙烯基醚。由3,5-二溴-2-吡喃酮的C3-选择性Stille偶联反应制备必需的3-(3,4-亚甲基二氧苯基)-5-溴-2-吡喃酮。还应注意的是,溴乙烯可以用作进一步衍生化的处理。