Base catalysed synthesis of thiochromans and azo-linked chromenes using allenylphosphonates
作者:M. Phani Pavan、M. Nagarjuna Reddy、N. N. Bhuvan Kumar、K. C. Kumara Swamy
DOI:10.1039/c2ob26285a
日期:——
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。
Stereoselective Synthesis of Pyrrolo[1,2-a]indoles from Allenes in PEG-400 as the Reaction Medium
作者:K. Kumara Swamy、M. Phani Pavan
DOI:10.1055/s-0030-1260533
日期:2011.6
Base-catalyzed domino cyclization of allenes with 3-chloro-2-formylindoles in PEG-400 was investigated. Pyrroloindoles were formed stereoselectively as single products. The structure of the product depends on the type of allene used. Two compounds have been characterized by single crystal X-ray diffraction.
研究了 PEG-400 中丙二烯与 3-氯-2-甲酰基吲哚的碱催化多米诺环化。吡咯并吲哚立体选择性地形成为单一产物。产品的结构取决于所用丙二烯的类型。两种化合物已通过单晶 X 射线衍射进行了表征。