Symmetrical spiro-phosphoroheterocycles from the selenation of carbohydrazides
作者:Guoxiong Hua、David B. Cordes、Yang Li、Alexandra M.Z. Slawin、J. Derek Woollins
DOI:10.1016/j.tetlet.2011.04.058
日期:2011.6
new symmetrical spiro heterocycles in 48–76% isolated yields. However, under identical conditions, treating Woollins’ reagent with thiophene-2-carbohydrazide leads to an additional product, 1,3,4-selenadiazole (27% yield) together with the spiro phosphorus heterocycle in 44% yield. Three representative X-ray structures are reported.