Bifunctionalized Allenes. Part XV. Synthesis of 2,5-dihydro-1,2-oxaphospholes by Electrophilic Cyclization Reaction of Phosphorylated α-Hydroxyallenes
作者:Ismail Ismailov、Ivaylo Ivanov、Valerij Christov
DOI:10.3390/molecules190811056
日期:——
This paper discusses a reaction of phosphorylated α-hydroxyallenes with protected or unprotected hydroxy groups involving 5-endo-trig cyclizations. Various electrophilic reagents such as sulfuryl chloride, bromine, benzenesulfenyl and benzeneselenenyl chlorides have been applied. The paper describes the reaction of 1-hydroxyalkyl-1,2-dienephosphonates with electrophiles that produces 2-methoxy-2-oxo-2
Metal-free synthesis of chlorinated and brominated phosphinoyl 1,3-butadiene derivatives and its synthetic applications
作者:Teng Liu、Yun-Tao Xia、Jie Zhu、Ai-Min Lu、Lei Wu
DOI:10.1016/j.tetlet.2015.10.029
日期:2015.11
We report here an efficient and transition-metal free strategy for the synthesis of chlorinated and brominated phosphinoyl 1,3-butadienes and derivatives. Pre-prepared HCl/HBr solutions enabled the in situ rearrangement of phosphinoyl-α-allenic alcohols to conjugated vinyl cations, which afforded various novel polysubstituted phosphinoyl 1,3-butadienes in medium to excellent yields. The resulting products
Bifunctionalized Allenes. Part XIII. A Convenient and Efficient Method for Regioselective Synthesis of Phosphorylated α-Hydroxyallenes with Protected and Unprotected Hydroxy Group
作者:Ismail Ismailov、Ivaylo Ivanov、Valerij Christov
DOI:10.3390/molecules19056309
日期:——
The paper describes a convenient and efficient method for regioselective synthesis of phosphorylated α-hydroxyallenes using an atom economical [2,3]-sigmatropic rearrangement of intermediate propargyl phosphites or phosphinites. These can be readily prepared via reaction of protected alkynols with dimethyl chlorophosphite or chlorodiphenyl phosphine respectively in the presence of a base.