Synthesis of tricyclic spirophosphoranes via reaction of 2-(4,5-dihydrofuran-3-yl)-N-phenyl-1,3,2-oxazaphospholidine with C,N-diarylnitrile imines
作者:Yu. G. Trishin、V. I. Namestnikov
DOI:10.1134/s1070363215020176
日期:2015.2
Unique tricyclic compounds with a five-coordinate phosphorus atom shared by three rings, 7-aryl-3',5-diphenyl-3,5-dihydro-2H-spiro[1,2-oxaphospholo[2,3-d][1,2,4]diazaphosphinine-8,2'-[1,3,2]oxazaphospholidines], have been synthesized for the first time via reaction of 2-(4,5-dihydrofuran-3-yl)-3-phenyl-1,3,2-oxazaphospholidine with C,N-diarylnitrile imines. Presumably, these compounds are formed via a three-step process including generation of P+-C=N-N- dipolar ion, intramolecular N--> C= cyclization with simultaneous opening of the dihydrofuran ring, and closure of oxaphospholane ring.