Hydrazinophosphonates and Hydrazinobisphosphonates: Novel Mitsunobu and Arbuzov-Type Multicomponent Application of the Morrison-Brunn-Huisgen Betaine
作者:Abdolali Alizadeh、Sadegh Rostamnia
DOI:10.1055/s-0029-1218681
日期:2010.5
A novel protocol for hydrazinophosphonate and hydrazinobisphosphonate synthesis by acylation, sulfonylation, and phosphorylation of the Morrison-Brunn-Huisgen zwitterion has been found. Interestingly, the reaction leads to hydrazinophosphonates via an Arbuzov-type multicomponent pathway. trialkylphosphites - diisopropyl azodicarboxylate - hydrazinobisphosphonates - hydrazinophosphonates - multicomponent
were allowed to react with a nucleophile (silyl enol ether or allyltributyltin) in the presence of an acyl chloride derivedfrom (S)-alanine to afford the 1,2-addition products in good chemical yields and high stereoselectivity. The bromo groups were readily removed by a reduction process in which the double bond at C3–C4 was also reduced. Thus the reaction system provided a general method to synthesize