Process for preparing 1,5-benzothiazepine derivatives

Details Process for preparing 1,5-benzothiazepine derivatives Process for preparing 1,5-benzothiazepine derivatives

1990-04-30

1991-10-08

Bond, Robert T.

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

Organic compounds

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

C07D28104

Patent

active

050555758

ABSTRACT:
There is disclosed a process for preparing 1,5-benzothiazepine derivatives represented by the formula: ##STR1## wherein one of R.sup.1 and R.sup.2 is a lower alkyl group or halogen atom, and the other is hydrogen atom, R.sup.3 is a lower alkyl group or a lower alkoxy group, which comprises subjecting a propionic acid compound represented by the formula (II): ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 have the same meanings as defined above, and R.sup.4 represents hydrogen atom or an ester residue, to intramolecular ring closing reaction in the presence of a sulfonic acid compound represented by the formula (III):

REFERENCES:
patent: 4567175 (1986-01-01), Takeda et al.

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