A stable chiral (acyloxy)borane (CAB) complex is prepared in situ by mixing a tartaric acid derivative and arylboronic acids at room temperature. A solution of the catalyst is effective in catalyzing hetero Diels-Alderreactions to produce dihydropyrone derivatives of high optical purities.
A stable chiral (acyloxy)borane (CAB) complex is prepared in situ by mixing tartaric acid derivative and arylboric acid at room temperature. A solution of the catalyst is effective to catalyze hetero Diels-Alder reaction to produce dihydropyrone derivatives of high optical purities.
MARUOKA, KEIJI;ITOH, TAKAYUKI;SHIRASAKA, TADASHI;YAMAMOTO, HISASHI, J. AMER. CHEM. SOC., 110,(1988) N 1, 310-312