A Formal [4 + 4] Complementary Ambiphile Pairing Reaction: A New Cyclization Pathway for ortho-Quinone Methides
摘要:
A formal, one-pot [4 + 4] cyclization pathway for the generation of eight-membered sultams via in situ generation of an ortho-quinone methide (o-QM) is reported. The pairing of ambiphilic synthons in a complementary fashion is examined whereby o-fluorobenzenesulfonamides are merged with in situ generated o-QM in a formal [4 + 4] cyclization pathway to afford 5,2,1-dibenzooxathiazocine-2,2-dioxide scaffolds under microwave (mW) conditions. The method reported represents the first use of an o-QM in a formal hetero [4 + 4] cyclization.
Intramolecular monomer-on-monomer (MoM) Mitsunobu cyclization for the synthesis of benzofused thiadiazepine-dioxides
作者:Pradip K. Maity、Quirin M. Kainz、Saqib Faisal、Alan Rolfe、Thiwanka. B. Samarakoon、Fatima Z. Basha、Oliver Reiser、Paul R. Hanson
DOI:10.1039/c1cc14807a
日期:——
The utilization of a monomer-on-monomer (MoM) intramolecular Mitsunobu cyclization reaction employing norbornenyl-tagged (Nb-tagged) reagents is reported for the synthesis of benzofused thiadiazepine-dioxides. Facile purification was achieved viaring-opening metathesis (ROM) polymerization initiated by one of three metathesis catalyst methods: (i) free metathesis catalyst, (ii) surface-initiated catalyst-armed silica, or (iii) surface-initiated catalyst-armed Co/C magnetic nanoparticles.
A Formal [4 + 4] Complementary Ambiphile Pairing Reaction: A New Cyclization Pathway for <i>ortho</i>-Quinone Methides
作者:Thiwanka B. Samarakoon、Moon Y. Hur、Ryan D. Kurtz、Paul R. Hanson
DOI:10.1021/ol100495w
日期:2010.5.21
A formal, one-pot [4 + 4] cyclization pathway for the generation of eight-membered sultams via in situ generation of an ortho-quinone methide (o-QM) is reported. The pairing of ambiphilic synthons in a complementary fashion is examined whereby o-fluorobenzenesulfonamides are merged with in situ generated o-QM in a formal [4 + 4] cyclization pathway to afford 5,2,1-dibenzooxathiazocine-2,2-dioxide scaffolds under microwave (mW) conditions. The method reported represents the first use of an o-QM in a formal hetero [4 + 4] cyclization.