An efficient base catalysed approach to the synthesis of thiochromans/chromenes from allenylphosphonates (and an allenoate) and substrates having SH/OH and CHO groups at appropriate positions has been developed. Several azo-linked chromenes that are bright red pigments are also synthesized. This methodology involves the domino reactions of Michael addition and subsequent cyclisation by intramolecular aldol reaction.
我们开发了一种高效的碱催化方法,可以从烯基
膦酸盐(和一种烯酸盐)以及在适当位置具有 SH/OH 和 CHO 基团的底物中合成
硫代苯并
吡喃/苯并
吡喃。此外,还合成了几种具有鲜红色
颜料特性的偶氮连接色烯。这种方法涉及迈克尔加成的多米诺反应和随后通过分子内醛醇反应的环化反应。