Process for the recycle of a waste product of diltiazem synthesi

Details Process for the recycle of a waste product of diltiazem synthesi Process for the recycle of a waste product of diltiazem synthesi

1998-10-21

2000-09-05

Raymond, Richard L.

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

Organic compounds

Unsubstituted hydrocarbyl chain between the ring and the -c-...

560 17, 562401, 562431, C07C32362, C07D28110

Patent

active

061145238

ABSTRACT:
A process which allows the re-use of compounds of formula ##STR1## in diltiazem synthesis through a process of conversion to a mixture of enantiomers III-(2R,3R) and III-(2S,3S) is described.

REFERENCES:
patent: 5097059 (1992-03-01), Giordano et al.
patent: 5102999 (1992-04-01), Giordano et al.
patent: 5144025 (1992-09-01), Tentorio
patent: 5223612 (1993-06-01), Giordano et al.
MERK Index Citation 3247 Dilitiazem, 12.sup.TH Ed., 1996.
Yamada et al, Asymmetric Reduction of a 1,5-Benzothiazepine Deriviative with Sodium Borohydride-(S)-alphaAmino Acids: An Efficient Synthesis of a Key Intermediate of Diltiazem J. Org Chem 1996, 61 8586-8590.

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