2,6-Disubstituted Tetrahydropyrans by Domino Meyer-Schuster Rearrangement-Hetero-Michael Addition of 6-Alkyne-1,5-diols
作者:Martin Maier、Max Wohland
DOI:10.1055/s-0030-1260776
日期:2011.7
Starting from pentanediol various oct-6-yne-1,5-diols were prepared. In the presence of catalytic amounts of an Au(I) or Pt(II) catalyst transformation to cis-2,6-tetrahydropyrans was observed. It is assumed that this novel domino sequence proceeds via an initial Meyer-Schuster rearrangement of the propargylic alcohol yielding a hydroxyenone that undergoes an intramolecular oxa-Michael addition through a chairlike transition state to the tetrahydropyran system.
从戊二醇出发,制备了多种辛-6-炔-1,5-二醇。在金(I)或铂(II)催化剂的催化作用下,观察到它们转化为顺式-2,6-四氢吡喃。据推测,这一新颖的串联序列通过烯丙基醇的迈耶-舒斯特重排开始,生成一个羟基烯酮,然后通过类似椅式过渡态的过程进行分子内的氧迈克尔加成,形成四氢吡喃体系。