Selenium-induced cyclization of O-allyl oximes as a synthetic route to N-alkyl isoxazolidines
摘要:
Phenylseleneyl bromide easily reacts with O-allyl oximes to afford cyclic iminium bromides which can be reduced in situ with sodium borohydride to produce substituted N-alkyl isoxazolidines in good yield.
The organoselenium-induced ring-closure reactions of O-allyl oximes give cyclic iminium salts which react with water to afford isoxazolidines in good yield.
O-烯丙基肟的有机硒诱导的闭环反应生成环状亚胺盐,其与水反应以高收率得到异恶唑烷。
Optically active isoxazolidines and 1,3-amino alcohols by asymmetric selenocyclization reactions of O-allyl oximes
The selenyl triflate generated from the reaction of di-2-[(1S)-1-(methylthio)ethyl]phenyl diselenide with silver triflate reacts with various substituted O-allyl oximes to promote ring closure, which affords optically active isoxazolidines in high yields and with good diastereoselectivity (up to 93:7). Enantiomerically enriched 1,3-aminoalcohols can be easily obtained by NO bond cleavage of these
Phenylseleneyl bromide easily reacts with O-allyl oximes to afford cyclic iminium bromides which can be reduced in situ with sodium borohydride to produce substituted N-alkyl isoxazolidines in good yield.
New synthesis of isoxazolidines from the selenium-induced cyclization of O-allyl hydroxylamines
The reaction of O-allyl hydroxylamines with phenylselenenyl sulfate, generated from the oxidation of diphenyl diselenide with ammonium persulfate, easily affords N-alkyl isoxazolidines as the result of a cyclization reaction through the formation of a carbon-nitrogen bond.