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Stereoselective 1,3-dipolar cycloadditions asymmetric reaction between C,N-diarylnitrones and methacrolein catalyzed by the aqueous complex [(C5Me5)Rh(DPPP).(H2O)] (SbF6)2, (DPPP = bis 1,2diphenylphosphinopropane) at -20 oC are described. We have succeeded in synthesizing nitrones described in the literature with good yields, and those, N-phenyl-Cphenylnitrones which are not described in the literature, with appreciable yields. The isoxazolidines formed from the condensation of these nitrones with methacrolein have been found to be new compounds. The resulting endoisoxazolidines are obtained in modest to high regioselectivity and with ee up to 91%.

Regio- and stereoselectivity of [3+2] cycloaddition reaction of methacrolein with diarylnitrones catalyzed by chiral rhodium complex