Novel optically active chroman derivatives, their preparation an

Details Novel optically active chroman derivatives, their preparation an Novel optically active chroman derivatives, their preparation an

1984-03-12

1987-02-24

Chan, Nicky

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549408, C07D31172

Patent

active

046458450

ABSTRACT:
Novel optically active chroman derivatives of the general formulae Ia and Ib ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each hydrogen or alkyl and X is --OH, --O--CO-alkyl, --O-alkyl, --O-tosyl, --O-mesyl, --O-benzenesulfonyl, Cl, Br or I, are prepared by a process in which

REFERENCES:
patent: 4003919 (1977-01-01), Scott et al.
Cohen et al, J. Org. Chem., 41, (1976), p. 3505.
Scott et al., Helvetica Chimica Acta, 59, (1976), p. 290.

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