Synthesis of derivatives of pyrido-[1,2-c][1,3,2]oxazaborinine and pyrido-[2,1,6-f,g][1,3,7,2]dioxazaphosphacyclo-decane

The condensation of 2,6-di(o-hydroxyphenyl)-3,5-diphenyl-γ-piperidone with boric and boronic acids gave a series of 1,3,4,11b-tetrahydro-2H-benzo[e] pyrido[1,2-c][1,3,2]oxazaborinin-2-ones. The action of phosphorus oxytrichloride on this piperidone gave a derivative of 8,10-dioxa-21-aza-9-phospha- pentacyclohenicosahexaene. © 2008 Springer Science+Business Media, Inc.