title: PNPCB heterocycles via thermal and Lewis acid catalyzed trans-hydroborations.
abstract: The compounds iPr2P(BH3)N3, tBu2PC[triple bond, length as m-dash]CR (R = Ph , tBu , Cy ) and Ph2PC[triple bond, length as m-dash]CR (R = Ph , tBu , Cy ) were reacted to give the products tBu2P(C[triple bond, length as m-dash]CR)NP(BH3)iPr2 (R = Ph , tBu , Cy ) and Ph2P(C[triple bond, length as m-dash]CR)NP(BH3)iPr2 (R = Ph , tBu , Cy ). Subsequent thermally induced or Lewis acid catalyzed intramolecular hydroboration of and afforded the PNPCB heterocyclic compounds Ph2P(C[double bond, length as m-dash]CHPh)NP(BH2)iPr2 and tBu2P(C[double bond, length as m-dash]CHPh)NP(BH2)iPr2, respectively. Compounds and were crystallographically characterized and the mechanisms and implications for the synthesis of inorganic heterocycles are considered.
authors.affiliation: Department of Chemistry, University of Toronto, 80 St George St, Toronto, Ontario M5S 3H6, USA. dstephan@chem.utoronto.ca.
authors.forename: Louie
authors.initials: L
authors.lastname: Fan
authors.affiliation: Department of Chemistry, University of Toronto, 80 St George St, Toronto, Ontario M5S 3H6, USA. dstephan@chem.utoronto.ca.
authors.forename: Douglas W
authors.initials: DW
authors.lastname: Stephan